Fuuka and Rinne were raised in the same orphanage and were formerly great friends, but they split up when a quarrel ended with Rinne overwhelming Fuuka with her martial arts talents. After leaving the orphanage, Fuuka lives in poverty. Fuuka's hidden fighting potential was revealed during an unintentional encounter with legendary martial arts champion Einhald Stratos; Einhald offered Fuuka a job and coaching, pushing her to meet up with Rinne again—in the ring.