After receiving some injuries following a fight with some punks, orphan Fuuka Reventon is helped out by Einhart, who invites her to come to the Nakajima Gym afterwards. Noticing Fuuka's potential as a martial artist, Einhart offers her a part-time job at the gym. Despite having a hatred of martial arts after losing to her former friend, Rinne Berlinetta, Fuuka accepts the job and starts off as a sparring partner for Vivio and her friends, becoming surprised by how strong they are. Hearing that Vivio is the one who broke Rinne's winning streak, Fuuka faces her in another sparring match, deciding to stop running away and aim to become stronger.