Rio Yuuki

"“Fairy Lancer, ready for action!” —Rio" Miu Himemiya (悠木 莉緒) is a character introduced in the anime Justice Alliance of Japan. Along with her companion Miu Himemiya, Rio is part of the two-member magical girl group called the Fairy Knights and has the ability to transform into Fairy Lancer. (フェアリーランサー)

Justice Alliance of Japan
Together with her childhood friend Miu Himemiya, she attends at a private high school Rouen Academy in her hometown of Kobe.

Miu Himemiya
Miu is Rio's childhood friend and fellow classmate.