Burn Your Fighting Spirit!

Burn Your Fighting Spirit! (闘志を燃やせ！) is the seventh song in the film Kaiju of Retribution Tatsura, sung by Yukimura Katsuki during Tatsurou Akiyama's rigorous training with him.

Usage
Tatsurou Akiyama has been despairing over the loss of his older sister Rinko Akiyama and his love interest Yukikaze Mizuki to the brothel masters at Yomihara. The samurai Yukimura Katsuki, who is hiding his identity from the world since faked death 15 years ago, offers Tatsurou the chance to bring back Yukikaze and Rinko, through the means of time travel. But before anything could be done, Yukimura sees the fragile combat experience and incompetency within the young Taimanin man and begins training him rigorously through harsh activities and staggering expectations. Some of these activities include walking on rocks underneath lava, traversing through a blizzard and climbing a mountain, all of which Tatsuro failed to do initially.

The song is played through the entire training montage. The beginning shows Tatsurou's inability to keep up with Yukimura's training, usually to the chagrin of both. Throughout the music, Yukimura insults Tatsurou, but makes sure that his contempt will change by making him strong. At some point, Yukimura threatens to give up training Tatsurou and leave him to his misery. However, Tatsurou will have none of that misery anymore and is determined to become strong, gradually becoming more skilled and competent until he starts making ideal results in his training, even winning a swordfight against Yukimura. The samurai expresses favor and satisfaction to Tatsurou's overwhelming improvement, to which, after the end of the song, he expresses as something he had never seen in two decades. The song ends with Tatsurou raising his fist in the air at the top of a mountain.

Releases
The song is available in two albums:
 * Kaiju of Retribution Tatsura Original Soundtrack Disc 1 - Track 21
 * The Best of Mahou Kaiju Series Music Anthology Disc 3 - Track 10

Trivia

 * Tatsurou's fist raising at the end of the song is an homage to the iconic scene in the Rocky series, with the title character climbing the steps by the Philadelphia Museum of Art and triumphantly posing to end his training montage.