Under Eden

Under Eden (アンダーエデン) was a brothel ran by Real located at the very heart of Yomihara. In Kaiju of Retribution Tatsura, it is the location where Yukikaze Mizuki and Rinko Akiyama carry out their mission to infiltrate it by posing as slave prostitutes and find and rescue the former's missing mother Shiranui Mizuki.

Background
The brothel is located in the corner of Yomihara's main street. Under Eden is considered the most popular brothel in Yomihara that prides itself in providing "high-class" slave prostitutes who can be considered the ultimate carnal experts. Women sold to Under Eden are forced to go through a remodeling process using the finest in hellish craft, and then undergo "training" before working at the brothel. The owner, Real, is able to gain resources and the latest in demon technology thanks to his connections to various crime syndicates like NOMAD and Fat Pipe. Under Eden has an advanced high-tech surveillance system that lets them monitor and record footage of their slave prostitutes. Often the footage recorded is posted on Under Eden's website which is located on the dark web.

Obtaining Slave Prostitutes
Most women that were sold to Under Eden are those that were kidnapped by a "Slaver". Slaver are hunters that traffic both humans and demons. Under Eden has several Slavers under their payroll, with Zokuto being the most well known example. Usually conditions of the sale are discussed between Real and the Slaver before the Slaver transport their captives to Under Eden. When a Slaver brings women to Under Eden to be sold, the women are subjected to a strict pat-down from the brothel's bouncers before being admitted to Real's office. The women brought to Real are given a choice: either consent to the terms of a "sex slave contract" or be killed on the spot. If the women agrees to sign the contract, the Slaver will then be given payment and are free to leave their captives with Real.

Sex Slave Contract
Due to the Rule of the Buried City, any woman that decides to work in a brothel in Yomihara must give their "consent" by signing a sex slave contract in their own blood. The terms of Under Eden's contract read as follows:

"A sex slave exists for the sake of providing the highest of pleasures as such, her status isn't similar to that of a simple slave. Because expertise and steadiness is required at all times, a firm disciple is imperative. This also means that a sex slave is highly compensated. After 2 years of service, they are freed from their thralldom and paid a share of the total sum they accrued for their owner. The contract itself is enforced by the Hell's Pact method. Witnessed by a local notary, (insert name here)'' will enter in a binding agreement with the bordello's owner. Upon the signing, they will swallow a pill spawned by Hell's biotech. Inside is a special kind of nanomachine infused with demonic cells dubbed the "Myriad Chimera". As proof of the established bargain, the machines will carve the seal of their new status upon their bodies. The seal not only displays their condition as sex slaves, but also prevents any behavior incompatible with it, such as escape attempts. For instance, if at any time they find themselves more than 1 kilometer away from their workplace, the Myriad Chimera will activate. The machines living in their blood would then secrete a special explosive toxin, ripping their limbs from their bodies. The seal is absolute. The Myriad Chimera will hide in their bodies and will constantly monitor for manifestation of rebellion.''"

Once the contract has been signed, the women will take the pill containing the nanomachines. The slave mark will then appear on their tongues and lower abdominal. At this point they are required to address Real as their "master".

Remodeling Process
After 1 day of giving his new "employees" time to rest, Real will bring the "slave prostitutes-in-training" to Under Eden's medical room to undergo remodeling. The process of remodeling someone, both physically and mentally, to be better suited to be a slave prostitute takes about 2 weeks. During the first week, Under Eden's medical staff will repeatable apply a lotion to the women that physically increases their sensitivity to sexual stimuli. The second week focuses on mental remodeling as the women are forced for wear VR-like headset that has them seeing themselves be put through lewd situations with the demon technology tricking their nervous systems to feel what they are seeing. During the 2 week remodeling process, the women are strapped to machines that takes care of all of their basic needs like feeding them spam-like substance and water through tubes, as well as bathroom needs. It is also at this point that Under Eden high-tech surveillance system starts filming the women as they undergo the process of becoming slave prostitute.

Slave Prostitutes Uniform
Once the remodeling process is complete, the slave prostitutes-in-training are given their official uniforms to be identified as sex slaves for Under Eden. The standard uniform consist of black evening gloves, a black choker, black stockings, high-heels, and a white two-piece micro bikini. Each uniform is custom made. Although there is a standard set for the uniform (seen worn by Rinko and other slave prostitutes that work for Under Eden), some customization can be done for individual slave prostitutes. For example, Yukikaze's uniform had some alterations such as no stockings, the black evening gloves are switched out for white bridal gauntlets, and she wears white high-heels instead of the standard black ones. Whenever a slave prostitute leaves the brothel to travel the streets of Yomihara, they are usually required to wear their uniforms.

Slave prostitutes aren't limited to wearing just their uniforms, as Under Eden provides several different clothing to them, usually as a means to fit a client's particular fetish. Replica Taimanin outfits have been a known favorite among Under Eden's clientele. Under Eden was able to provide almost identical replica of Yukikaze and Rinko's Taimanin suites in them. Granted the suites were made from cheaper materials and can tear easily.

Room Assignment
After the slave prostitutes are fitted for their uniforms, they are then assigned their rooms. The room will act as a living space for a slave prostitute during their stay in Under Eden, as well as the main location of where they will service their customers. Rooms provide basic amenities and utilities. Each room includes a bathroom, a small kitchen, mini-fridge, makeup table with a mirror, a small office desk, and a queen-sized bed. Additional decorations and furniture can be added, usually given to slave prostitutes as gifts from their customers.

The rooms offer very little privacy, as Under Eden's advanced surveillance system continuously monitors slave prostitutes in order record footage that can be sold and/or posted on Under Eden's website. Slave prostitutes are free to visit each other in their rooms during their off-hours.

Training
Shortly after their room has been assigned the slave prostitutes begin their "training" which is overseen by Real. During this time the slave prostitutes have to learn how to do the proper greeting, how to behave around customers, and sexual techniques. Slave prostitutes are forced to repeatedly to perform sexual intercourse with Real. Sometimes Real would have the slave prostitute "practice" with different forms of demon technology. Slave prostitutes are mostly confined to their rooms during training and aren't allowed interact with other slave prostitutes. The process takes about 1 month. If a slave prostitute proves to be too stubborn or rebellious they may be subject to the flesh vessel for "special training".

Flesh Vessel
The flesh vessel is a tool created with the culmination of demon technology. Its an organic containment pod meant to restrain a person and ravish them with tentacles non-stop. Its capable of keeping a person alive for days, taking care of basic needs like "food". The flesh vessel is in the basement levels of Under Eden along with the medical room. Real would often put his more rebellious slave prostitutes in the organic pod as a cruel form of punishment. In the Evil Universe's timeline, Rinko apparently spend 2 weeks in the pod during her training, an advent that left her severely traumatized.

Debut Show
Once the training is complete, slave prostitutes are forced to do the debut show in Yomihara's town square. Often this requires the slave prostitutes to make some sort of humiliating pose or action while introducing themselves to the evil denizens of Yomihara. There introduction speech is rehearsed beforehand during their time in training. Afterward, the slave prostitutes are then require to service any customer willing to pay as part of the show.

Daily Life
Once a slave prostitute makes their debut, they are then put to work. They often service numerous customers in their rooms each day. The more currency a slave prostitute makes, the more freedoms they are given. If a slave prostitute make enough money for the brothel, then they would be allowed to walk around freely in Yomihara during their off hours, so long as they stay within the 1 km limit. Slave prostitutes are under the protection of Under Eden when they walk around Yomihara, as they have become an "expensive commodity" for the brothel, and thus the denizens of the buried cities usually will not assault them. Apparently, getting service from a slave prostitute from Under Eden is very expensive, specially one of the top slave prostitute, as Zokuto mentions that he would not be afford it, despite being the one who captures several of the women trapped in the brothel. If a women is awarded the position of one of Under Eden's top slave prostitutes then they would only need to service VIP customers.

Pregnancy
Unlike most brothels in Yomihara, slave prostitute are actually encouraged to allow themselves to be impregnated by a client, and thus they do not wear protection. Real mentions slave prostitute would still have to work during their pregnancy since several of Under Eden's customers have fetishes for pregnant women. Apparently, customers can pay to watch a slave prostitute as she is giving birth. Slave prostitutes aren't allowed to keep the children they give birth to while they are working for Under Eden. The children of slave prostitutes are usually sold off to the evil syndicates in Yomihara.

VIP Events
These events are gatherings of Under Eden's most influential VIP customers. Only Under Eden's best slave prostitutes are allowed to attend these advents. The slave prostitutes chosen for these advents are ones that were able to bring in the most currency. Be chosen to attend a VIP event is the fastest way for a slave prostitute to gain all the freedoms that Under Eden would allow, namely be able to freely walk around Yomihara. Real would encourage his slave prostitutes to be the one chosen for the VIP events with the promise of more money and the connections that VIP customers could bring.

End of Service
Once a slave prostitute complete their 2 years of service, they are released from the Myriad Chimera and are paid a share of the total sum they accrued for Under Eden. Supposedly, they would then be free to leave Under Eden. However, because of the brainwashing and conditioning done to them over the years, many slave prostitutes known to develop Stockholm syndrome and chose to continue to serve the men in charge of Under Eden even when their initial time as a slave prostitute was finished. There have been cases where Under Eden's VIP customer would take a former slave prostitute under their care to be their mistress.

Shiranui Mizuki's Disappearance
5 years before the "Matoi Mission", Shiranui was assigned by the Japanese Government to investigate the underground city of Yomihara. Unknowingly to her, the entire mission was a setup arranged by Muneichi Yazaki and masterminded by Ryuuji Kuroi. While in Yomihara, Shiranui was discovered and attacked by a horde of demons. Although she was able to hold them off, she was eventually knocked out by a pink-haired female Slaver. Shiranui was taken to Under Eden by the Slaver and sold to be a slave prostitute. Like with other slave prostitutes, she was forced to undergo the remodeling process and had to do the contracted 2 years of service. Although Shiranui was able to complete the 2 years of service, Under Eden was able successfully condition her to be a subservient slave. The brainwashed Shiranui continued to serve Ryuuji Kuroi and Muneichi Yazaki as both a mistress and enforcer long after her time as a slave prostitute was finished. Due to her conditioning, Shiranui didn't attempt to contact her Taimanin allies during her new life as Ryuuji and Muneichi's slave and was considered MIA by her friends and family.

The Matoi Mission
The "Matoi Mission" was the official name of the search and rescue mission of Shiranui Mizuki. The mission has given by the Japanese Government after reports came in that there were recent sighting of Shiranui in Yomihara. The assignment was classified as a "sheathed mission" (the Taimanin jargon for undercover investigations that requires radical changes to ones identity). The plan for the mission was to have the recently captured Slaver, Zokuto, smuggle two female Taimanin past Yomihara's borders. The Taimanin would pretend to be Zokuto's prisoners. Once in Yomihara, Zokuto would sell the Taimanin to a brothel. Supposedly, Zokuto made arrangements with the brothel's owner so the Taimanin would only have to "act" like prostitutes but be given the freedom to investigate. In exchange for his help, Zokuto was offered amnesty for his crimes. It was disclosed that the Taimanin might have to service some customers in order to keep their cover. There would limited contact with Gosha Academy during the mission and the Taimanin would have to rely on Zokuto as their main form of communication.

After considering many potential volunteers for the mission, the Japanese Government and the Taimanin chose Yukikaze Mizuki and Rinko Akiyama. The supposed reasoning for choosing these Taimanin was that Yukikaze, being Shiranui's daughter, would be able to identify her missing mother even if her appearance has changed, and Rinko's ability to teleport people for up to 1 km would allow for a quick extraction when Shiranui is found. However, Asagi Igawa, the leader of the Taimanin, had her concerns over the decision, believing that while Yukikaze and Rinko are indeed powerful fighters, the 2 younger Taimanin lack the experience needed for the undercover mission. After discussing the issue with Yukikaze and Rinko, Asagi decided to believe in her student and authorizes the mission.

Unknown to the Taimanin, the Matoi mission was actually another setup arranged by Ryuuji and Muneichi. Muneichi wanted revenge on Yukikaze and Rinko for ruining his deal with a group of demons and for Yukikaze permanently damaging his jaw when she kicked him. Ryuuji found their combat abilities to be impressive, and want to enslave the two or remove them as a threat. Zokuto was in on their plan and intended to betray the Taimanin from the very beginning. As planned, Yukikaze and Rinko meet with Zokuto in the Metropolitan Area Outer Underground Discharge Channel, before the unlikely trio adventure into the tunnel systems leading to Yomihara. The Taimanin quickly make their dislike for the Slaver known and made it clear that they will kill him if he makes any attempt to sabotage them. Zokuto can only respond fear, giving the naive Taimanin a false sense of confidence, believing that they would be able overpower any obstacle that came their way and underestimating Zokuto. Taking advantage of this, Zokuto convince Yukikaze and Rinko to allow themselves to have chain, blindfold, and gags placed on them when they crossed Yomihara's border, which be the Taimanin's first fatal mistake. The inexperienced Taimanin did not realize that the gags were devices that every hour secrete drugs that decrease muscular strength. Afterwards, the trio was able to travel past Yomihara's security and to Under Eden.

Once the Taimanin and Zokuto reach Under Eden, they were taken to Real's office. Real had Zokuto remove bind and gags from Yukikaze and Rinko, who at this point started to notice their declining strength. Real then explains to the two young women about their position and how they would have to give their "consent" via contract to becoming Under Eden's newest slave prostitutes, much to their confusion as this doesn't match up with the arrangements that Zokuto supposedly made with the brothel's owner. Zokuto discretely explain that being slave prostitutes would put them in a better position to do their investigation than a normal prostitute due to additional "freedoms" a slave prostitute could eventually gain. Although the Taimanin realized that they have tricked at this point, they ultimately agreed to the contract due to their weakened state preventing them fighting back and being slave prostitutes for Under Eden would currently be their best chance to find Shiranui. After signing the contracts, the Myriad Chimera were placed in the Taimanin's bodies, and Yukikaze and Rinko were official sold to Real.

The following day Yukikaze and Rinko were brought to Under Eden's medical room in order to undergo the remodeling process. During the remodeling process, Zokuto visited the Taimanin in order to make his report to Gosha Academy. Despite their mission not going as intended, Rinko told Zokuto to report to Asagi that the mission was progressing smoothly and to not mention their agreement to be slave prostitutes for Under Eden. Zokuto later relayed the report to Asagi.

At Gosha Academy, Asagi discussed Yukikaze and Rinko's mission and report with her sister, Sakura Igawa, after pulling her aside while she was teaching a special training camp. Tatsurou Akiyama, who was a part of the training camp, happen to overhear the discussion and used his wind manipulation ability to spy on the sisters.

Divergence Point - The Main Universe's Timeline
After hearing the details of the mission, as well as the report given by Zokuto, Tatsurou couldn't help but worry about his childhood friend and sister. After taking the time to think it over, Tatsurou couldn't shack the feeling that something terrible was going on. Ultimately, Tatsurou determined that the mission needed to be canceled. After building up his courage to speak up, Tatsurou addressed his concerns to Asagi. Since Asagi already had her suspicions about the mission, she took Tatsurou's judgement very seriously. The Taimanin at Gosha Academy came up with a plan personally check on the conditions of Yukikaze and Rinko.

During Zokuto's next visit at Gosha Academy to give his report, Sakura used her Ninja Art - Shadow-Style Jutsu to hid herself in Zokuto's shadow without him knowing. Sakura spied on the Slaver as he returned to Under Eden and to her shock witnessed Yukikaze and Rinko start the 2nd week of remodeling process. Eventually, Sakura reported her findings to Asagi. The Igawa sisters decide to end the mission and bring their students home. Just like before, Sakura used her Ninja Art to hid in Zokuto's shadow, this time accompanied by her older sister, as they get ready to rescue their students. Once in Under Eden, the sisters left Zokuto's shadow, hid themselves in Real's office, took care of his demon bouncers, and brought Yukikaze and Rinko's weapons and a change of clothes.

At this point, Yukikaze and Rinko's remodeling was complete and the two women were about to start their "training". Thankfully, on the training day where Real would have taken Yukikaze and Rinko's virginity, he finds himself confronted by the Igawa sisters in his office. Asagi and Sakura offers Real a deal, if he releases Yukikaze and Rinko from their contract, they will spare his life. If he does not comply, they will kill him before he can try anything. Real begrudgingly agrees to the terms, destroy the sex slave contract, and gives Yukikaze and Rinko pills that would purge their bodies of the Myriad Chimera. Still wanting to find and save Shiranui, the two younger Taimanin try to convince their teachers to let them continue the mission, but this is denied. Asagi chastise her students for their naivete and the false reports they have given, although Sakura did acknowledge their hearts were in the right place. Yukikaze and Rinko followed their superiors' orders. They took the pills given to them, changed into their Taimanin suites, and armed themselves to make their escape. Before leaving Yukikaze decide to shoot Real in the face with a non-lethal lightning blast as payback for everything he put them through. The injured Real order his remaining security forces to chase after the 4 Taimanin as they go to fight their way out of Yomihara.

The Taimanin were able to make it back to their village with only minor injuries. Unfortunately, the Matoi Mission had to be deemed a failure as none of the Taimanin were not able to locate the still missing Shiranui. The remodeling done on Yukikaze and Rinko during their time in Under Eden was reversed by Sabato Kiryuu with assistance from Murasaki Yatsu. Despite the mission being considered a failure, the Taimanin were able to find a silver-lining to their situation. Kiryuu discovered microchips implanted in Yukikaze and Rinko's bodies when undoing their remodeling. After studying the microchips, Kiryuu discovered that they had a great deal of information on them, including a new lead of Shiranui Mizuki's whereabouts.

Divergence Point - Evil Universe's Timeline
Unlike in the Main Universe's Timeline, Tatsurou choose to believe in Yukikaze and Rinko, and not voice his concerns to Asagi. As a result of his decision, the Igawa sisters did not interfere and aborted the mission about 2 weeks in when it started. The Matoi Mission continued on.

After undergoing the remodeling process, Yukikaze and Rinko found themselves in a constant state of sexual arousal and their sensitivity to sexual stimuli has greatly increased. They got fitted for their Under Eden uniforms and were assigned their rooms to serves as their live space and "work area". The two would then start their "training" to become slave prostitutes. Real first had the two Taimanin practice the official greeting of Under Eden before moving on to the main part of a slave prostitute's job, sexual intercourse. Normally, slave prostitutes are required to have sex with Real himself as their first partner, however in Yukikaze's case, Real brought in a VIP customer to take her virginity, the corrupt politician Muneichi Yazaki. Yukikaze was shocked to see her old foe at Under Eden, and she instinctively attacks him. But due to her weakened state from the remodeling process, Yazaki easily dodged the punch, grabs Yukikaze by the neck and slammed her petite body down on his leg. Real apologies to Yazaki and threatens to activate the Myriad Chimera in Yukikaze's body if she displays anymore rebellious actions. Yukikaze is forced to concede. Yazaki mocks the Taimanin and explain his intentions to impregnate her with his child, much to her disgust. Yazaki force Yukikaze to perform may demeaning sexual acts before proceeding to take her virginity. Rinko, who was left in her own room, was forced to watch her surrogate sister be violate via live transmission. Shortly after Yukikaze's time with Yazaki was finished, Real made his way to Rinko's room. Rinko, enraged at what she just witnessed, verbally lashes out at Real. Real simply remind her that he can activate the Myriad Chimera if she tries to resist him. Rinko then makes a declaration, that she will do as Real says for now, but once she earns her freedom after her 2 years of contracted service, she will personally make him pay. Although Real was at first taken aback by Rinko's threat, the brothel owner then begin to laugh at Rinko's moxie. He responds by stating that he promises do everything in his power to make Rinko "his woman" and that when he is done with her she will become someone who will "throw away everything for his sake". After both individuals make their intentions known, Real then has Rinko perform many humiliating actions before taking her virginity. After the forced sexual intercourse, Real mentions that Rinko reminds him of the "other Taimanin" he trained which Rinko make a mental note of.

The next morning, Yukikaze wakes up to find herself in her own room. Remembering the events of the previous night, Yukikaze quietly cries to herself over her defilement. Her sobbing is interrupted by a knock at the door. Yukikaze cleans herself up and find that the person who has come to visit her is Rinko. The older Taimanin then consoles Yukikaze, ensuring her that Tatsurou will still love her despite what has happened, and Rinko grimly confirms her own loss of her virginity. Rinko informs Yukikaze of the "other Taimanin" that she heard from Real and take it as confirmation that Shiranui was indeed a captive to Under Eden. Renewed in their hopes to find Shiranui, the 2 Taimanin prepare for the harsh month long training that awaits them. During their 1 month of "training", Yukikaze and Rinko were forced to do many degrading acts on a daily basis. They were either made to perform sexual intercourse with Real or train with the demon technology that Under Eden had available. The "slave prostitutes-in-training" had to go through several costume fitting, particularly of replica outfit of their Taimanin suites. Both Taimanin spent most of their training confided to their rooms. Since Real required them to train separately, they did not see each other over the course of the month. Keeping up with his promise to do everything in his power to make Rinko "his woman", Rinko was given particularly harsh treatment from the brothel owner. Real even went as far as to subject Rinko to the possibly Under Eden's most insidious form of demonic technology, the flesh vessel.

Real arranged for Rinko to be taken from her room while she was asleep. The unconscious Rinko was dressed in a replica of her Taimanin suite and then was place in the flesh vessel. Rinko eventually awoke from her sleep only to find herself confined and is utterly horrified by her surrounding. Real then talks to Rinko outside of the flesh vessel, explaining the purpose of the organic containment pod that she found herself in and that she will be ravished by the tentacles inside as a part of her "special training". After staying inside the flesh vessel for several minutes, Rinko was pushed to her limits as she was given a brief pause from her torment. Real speaks to Rinko once again, telling her that he forgot to mention one small detail, that Rinko will be left in the flesh vessel for 2 weeks straight. Hearing this, Rinko has an emotional breakdown as she desperately screams to be let out only for the flesh vessel to start back up again. Just as Real said, Rinko spent 2 weeks inside the containment pod. When finally released from her suffering and left on the verge of insanity, Rinko breaks down in broken laughter. Real ask the traumatized Rinko if she remembers him, which she meekly replies that she does. Real then states that is she ever defies him, he will immediate have her placed back inside the flesh vessel. Terrified, Rinko swears that she will do anything he says and will follow any order given by him, leaving Real satisfied. Real arranged for Rinko to through more mental remodeling to return her back to a functional state. However, the memories of her experience inside the flesh vessel would forever haunt Rinko and her personality began to change from that point on.

One the day of their debut show, Yukikaze and Rinko were finally able to reunite after their long month of training was complete. Both were happy to see the other physically appears uninjured, although they kept their mental trauma secret to one another. Real had the Taimanin come to his office and declares them to be official slave prostitutes of Under Eden. He then explain to them that they must preform a debut show in front of all of Yomihara. Although mortified that would have to go out in public in their Under Eden uniforms, the two women follow Real's orders. Real took the Taimanin to Yomihara's town square where they are greeted by a large mob of evil humans and demons. Yukikaze and Rinko were then instructed to introduce themselves as "ex-Taimanin" who realized the "errors of their ways" for fighting for justice and have become slave prostitutes as a means to repent for their past actions, while forced to make obscene poses. Their introductions are met with cheer and mockery from the crowd. Afterwards Real allowed the crowd to have their way with the women as their first official customers. After the debut show, Yukikaze and Rinko spent the next couple months as slave prostitutes. They serviced many customers on a daily basis, would visit each other during their off-hours, and had Zokuto continue give false reports of the mission's progress to Asagi. The Yukikaze and Rinko formulated a plan to find Shiranui. First, they would bring in enough currency for Under Eden to be free to walk around Yomihara to investigate. Eventuality, they will work their way up to becoming Under Eden's top slave prostitutes, which the position came with many benefits such as being able to attend VIP events. At the VIP events, they would be allowed to interact with members of Yomihara's upper echelon, the people who would likely know where Shiranui is. Additionally, the top slave prostitutes would only have to serve VIP customers, which would greatly reduce the number of people they need to service, giving them more free time to investigate. After 6 months of debauchery, Yukikaze and Rinko were able to achieve their goal of becoming Under Eden's top slave prostitutes. Shortly after their first VIP event, where Yukikaze and Rinko had to be Yazaki and Real's "dates", respectively, they were approached Zokuto was has some urgent news for them.

The Slaver reveals that Asagi has become suspicious of the information she was given over the last couple of months, and now wants somebody that she can trust to start make the progress reports of the mission. She arranged for Tatsurou, who just finished his training camp, to join in on the Matoi Mission, by posing as a Slaver apprentice for Zokuto. Asagi determined with Tatsurou being one of the lesser known Taimanin, should easily be able to enter Yomihara without being recognized. Realizing that Tatsurou would likely have the mission canceled if he found out the truth of them becoming actual slave prostitute, instead of being disguised as normal prostitutes, Yukikaze and Rinko realized that they would have to deceive Tatsurou. Rinko then comes up with a plan and requests Zokuto's help. Rinko's plan is for both herself and Yukikaze to posses as hostesses for one of the local bars near Under Eden, which they are able to do with little issue thanks to the great deal of free time they gained as Under Eden's top slave prostitutes. Zokuto agreed to assist Yukikaze and Rinko in their deception in exchange for having sex with them free of Under Eden's fees. One week after Zokuto told the Taimanin of the news, Tatsurou arrived in Yomihara and reunites with his childhood friend and sister after not seeing each other for several months. Tatsurou was surprised to find Yukikaze and Rinko "undercover" as hostesses, and mentions that Asagi gave a detailed briefing of the mission, including that they were suppose to be undercover as normal prostitutes. Yukikaze just berates Tatsurou for having "perverted ideas" and lies to Tatsurou that they made arrangement to be hostesses. Tatsurou was relieved that Yukikaze and Rinko appear in good health, especially when they lied saying that they have not had sex with anyone thanks to their new cover. Satisfied with the progress of the mission, Tatsurou left with Zokuto to give his report to Asagi and to make arrangement for a longer stay in Yomihara in the near future. Once Tatsurou left, Yukikaze was left guilt ridden for lying to the man she loved, and realizes that she would need to find her mother quickly before Tatsurou learns the truth.

Not long after Tatsurou's first visit, Rinko reveals to Yukikaze that she made a major breakthrough in their investigation. Apparently, she found out from one of Under Eden's VIP customers that a former Taimanin was forced to serve as a slave prostitute in Under Eden and was eventually able to buy her freedom after her 2 years of service. However, shortly afterwards she ended being taken by another VIP customer to be their personal slave. That particular VIP customer has known to bring the former Taimanin to one of Under Eden's VIP events at least once a year. It's been rumored that the former Taimanin will be brought to the next VIP advent. Believing that the former Taimanin is Shiranui, Yukikaze and Rinko make their rescue plan.

Yukikaze and Rinko informs Tatsurou that they might have found a lead on Shiranui's whereabouts, all while leaving out the parts about them being slave prostitutes. They had Tatsurou retrieve their weapons from Gosha Academy and stash them in a secret area in Yomihara, so them the time came to enact their plan, Rinko could use her Ninja Arts - Art of Sky Escape to teleport their weapons to her. The plan that Yukikaze and Rinko went over is that at the next VIP event, if they spot Shiranui, Rinko would summon their weapons and the pills in Real's office that would purge the Myriad Chimera from their bodies, since Rinko claims that she has rough idea of where they are. They would then take the VIP customers hostage until they release Shiranui. Finally, Rinko would use her ninja art once more to teleport them all out as close to Yomihara's border as she can, rendezvous with Tatsurou, and then fight their way out if needed. Now that they had a plan in mind, the Taimanin prepare for the next VIP event. At the start of the VIP event, Yukikaze was unable to find Shiranui, and Rinko seems to be missing as well. Assuming that they might arrive later in the night Yukikaze decide to service the VIP customers in the meantime, finding herself enjoying the sexual intercourse far more they she is willing to admit. The VIP event continued for several hours. After finishing her service, Yukikaze notice a familiar presence and to her horror sees Tatsurou watching her. Zokuto apparently told Tatsurou that something terrible has happened to Yukikaze and that he need to go to Under Eden right away. Panicked Yukikaze tries to explain the situation to Tatsurou only to be suddenly pinned down by several of Under Eden's customers. Yazaki then announces its time for the main advent and that he will be the one to explain everything to Tatsurou, as Yukikaze desperately plead him to stop.

Yazaki reveals to Tatsurou that Yukikaze and Rinko have been lying to him, that they are not hostesses but actual slave prostitutes. He also reveals that he was the one who set up the Matoi Mission and that the entire assignment was a trap. That he and Real are actually brothers and that they setup everything against the Taimanin. To prove this, Yazaki present Yukikaze and Tatsurou with the person they are looking for: Shiranui. Yukikaze, shocked to see her mother with Yazaki, desperately tries to call out her. Shiranui only responds with a cold stare and talks down to her own daughter. Yazaki explains what Shiranui has been his subservient slave for years, and in fact she was the one who told Yazaki about her relationship Yukikaze. Using that knowledge, Yazaki arranged for the Japanese Government to give out the Matoi Mission, knowing that Yukikaze and Rinko would most certainly be the Taimanin to volunteer for the mission. Heartbroken, Yukikaze make one last attempt to get through to her mother, only for Shiranui to talk down to her once again, causing Yukikaze to have an emotional breakdown. To further add to their misery, Real shows a video compilation of Yukikaze and Rinko's time as slave prostitutes in Under Eden. Real advertises that the full videos can be viewed on Under Eden's website on the deep web.

Up until this point, Tatsurou was left dumbfounded at everything that he was just witnessed. But then his disbelief turns into pure rage. Tatsurou decide to kill Yazaki and then escape Under Eden with Yukikaze. Tatsurou charges at Yazaki, killing any of the demon bouncers that got in his way. However, before he can cut down Yazaki, his attack is blocked by an unknown assailant. To Tatsurou's shock, the person who save Yazaki was his own sister Rinko.

Rinko apologies to Tatsurou, stating that Real's, her "master", orders are absolute and ask Tatsurou to forgive her as she attacks him. Real reveals that Rinko has been his personal slave for some time who will follow his every order. Apparently, after her time in the flesh vessel, Rinko truly cannot bring herself to against Real orders anymore after the torment she experienced. During her many months as a slave prostitute, Rinko developed Stockholm syndrome, actually fell in love with Real, and swore her loyalty to him. She tricked Yukikaze and Taturou, under Real's orders, to set them up and to reclaim her sword, the Ishikiri Kanemitsu, so that she would be able to fulfill her duty as Real's new enforcer. Rinko tells the stunned Taturou that he is free to scorn her, but she can't go against her feelings. Yazaki and Real laugh at the remark, as Real did indeed filled his promise to make Rinko "his woman that will throw everything way for his sake". Yazaki then tells Tatsarou that he plans on sparing the Taimanin's life so that he can report both the failure of the mission to Asagi and the fate of her students. He also gives a cruel joke, that Yukikaze will soon follow in Shiranui and Rinko's footsteps, but if he ever gets tired of Yukikaze, he will give her back Taturou. Enraged once again, Taturou makes one more attempt at Yazaki before being swift defeated and knocked out by both Shiranui and Rinko. As he passes out, he attempts to reach out to Yukikaze as his vision fades.

An injured Tatsurou would wake up on the outskirts of Yomihara, and with no way back in to the buried city, he is forced to leave. The Japanese Government order that the Matoi Mission be canceled and for all Taimanin to withdraw from Yomihara, undoubtedly thanks to Yazaki's influence. The Slaver Zokuto disappeared, robbing the Taimanin any chance of getting back into Yomihara. Officially, Yukikaze and Rinko were considered MIA along with Shiranui. Although many of the veteran Taimanin, like Asagi, knew the truth of Shiranui and Rinko's betrayal, they chose to keep it secret from the rest of the Taimanin so not to demoralize them. Tatsurou began viewing Under Eden's website to find clues on how he could save Yukikaze, Rinko, and Shiranui, but over time began to loss hope once it became clear to him that the women he loved have changed. Tatsurou would resign from his position as a Taimanin, and send his days viewing Under Eden's website, while Yukikaze, Rinko, and Shiranui continue to serve as slaves for Yazaki and Under Eden. 1 year passed after the Matoi Mission was canceled and Tatsurou continue to waste away in his room. He has since suffered from chronic depression after the advents at Under Eden. Throughout the year, Asagi and some of the other Taimanin have tried to help Tasurou, but with little success. During the 1 year time-skip, Rinko has become Under Eden's top enforcer as well as the brothel's number 1 slave prostitute. She is also in a relationship with Real, but service Yazaki and the other VIP customers. Shiranui continue act as Yazaki's personal slave/mistress and recently gave birth to their daughter, Hotaru. Yukikaze, like her mother, eventually become Yazaki's second personal slave and mistress. One day, Yazaki came to Gosha Academy with Yukikaze, who is now pregnant with his child. Although many Taimanin knew of Yazaki's involvement in the Matoi Mission, his political connections prevented any retaliation. He decides to bring Yukikaze to Gosha Academy as a means to demoralize the Taimanin and have her give her final goodbyes to Tatsurou before she leaves to start her new life as Yazaki's mistress. Tatsurou can do nothing but remain silent when reunited with Yukikaze. Although Yukikaze did all of the talking during their brief reunion, it has become obvious to him once again that she is no longer the woman he loved. After Yukikaze leaves with Yazaki, Tatsurou suffers a mental breakdown.

In the Evil Universe, the Matoi Mission was considered one of the greatest failures of the Taimanin. Asagi herself took the advents of mission really hard, personally blaming herself over what happened with her students. The Matoi Mission proves to be one of biggest the catalyst that eventually changed her to Vampire Asagi.

Staff

 * Nobunaga Oda
 * Real - Owner and Trainer
 * Muneichi Yazaki - Benefactor and a VIP Customer
 * Okichi Shinsato - Slaver
 * Zokuto - Slaver
 * Shiranui Mizuki - Slave Prostitute (formerly)
 * Yukikaze Mizuki - Slave Prostitute (formerly)
 * Rinko Akiyama - Slave Prostitute (formerly)
 * Tatsurou Akiyama (Evil Universe)- Slaver Apprentice (formerly)

Others

 * Asagi Igawa - Intruder
 * Sakura Igawa - Intruder

Trivia

 * The time frame that Yukikaze and Rinko stays at Under Eden for the Matoi Mission is different for each timeline:
 * In the main universe's timeline Yukikaze and Rinko stayed in Under Eden for a little over 2 weeks before the Igawa sisters canceled the mission and had their student extracted.
 * In the evil universe's timeline Yukikaze and Rinko stay at Under Eden for roughly 8 months before the Japanese Government official canceled the mission. Although Yukikaze and Rinko continued their contracted 2 years of service as slave prostitutes. Apparently, after their 2 years of serves Yukikaze left Under Eden to be Yazaki's personal slave, much like her mother, while Rinko continue to work at Under Eden for Real as the brothel's number 1 slave prostitute.
 * There is a brothel similar to Under Eden called Paradise which is located in Morino City