After a brutal encounter with gangsters, Fuuka Reventon, a fierce fighter struggling to survive, is rescued by martial arts champion Einhald Stratos. Recognizing Fuuka's potential, Einhald invites her to join Nakajima Gym, where she hesitates due to past ties with childhood friend turned rival Rinne Berlinetta. Eventually, Fuuka overcomes her reservations and trains under Einhald's guidance, determined to prove herself and confront Rinne's changed demeanor through martial arts.