Seiji "Mad Dog" Sawamura is the ultimate high-school punk. With his super-strong invincible right hand, he can punch through cement walls or entire street gangs. But street cred comes with a high price - every girl in the school is absolutely terrified of him! Just when he thinks he is doomed to fly solo forever, Seji's right hand becomes an actual girl! Midori Kasugano wished she could be by Seiji's side... but ended up somehow attached to his wrist. Seiji's fighting days may be over, but his girl trouble days are about to begin!