Seiji Sawamura is a feared high-school delinquent whose unbeatable 'Devil's Right Hand' has scared off every girl he tries to date. After his twentieth rejection, he wishes aloud that his right hand were his girlfriend. He wakes to find Midori Kasugano, a shy classmate who has loved him from afar for years, now living as a tiny girl growing from his right wrist, while her own body lies unconscious at home.