High school dropout Morio Kurokawa is an infamous delinquent known as "Morio the Black Panther," who has won many fights against others older than him. Walking through town with his posse, he comes across Yukiko Akaza, a girl with extremely poor vision due to a condition affecting her eyesight. Refusing to be intimidated by him, Yukiko encounters Morio time and time again, which causes him to fall deeply in love with her. Morio's urge to protect her grows every time they meet, and he begins to learn more about the hurdles Yukiko faces on a daily basis.