The protagonist is a karate expert who has become quite arrogant due to his undefeated status. Following a school bus accident, his face is reconstructed to resemble Rina Kurimi, a fellow student he also feels attracted to. After waking from a year-long coma, he is mistaken by Rina for her missing twin sister, Yuna. Despite much internal conflict, Randou decides to pretend to be Yuna until he can locate the real Yuna.
Initially, he struggles with behaving like a typical female high school student, and his original personality often emerges with chaotic results. Even after being in a coma for a year, he remains incredibly strong, which raises many questions given his petite size. A recurring gag involves him getting nosebleeds when stimulated. Over time, however, he learns a lot about what it means to be a female. One of his biggest fears is becoming permanently accustomed to life as Yuna. When it comes to matters involving Rina, he tends to be very selfless, prioritizing her happiness above all else.
His vibrant personality combined with Rina's cute appearance attracts numerous male admirers at school (and even one female admirer). He tries to handle these situations but usually ends up going berserk and beating them up, including the student president and various street thugs.
