The admirable middle-school girl gifted with both beauty and intelligence, Yagami Mitsuko, has a secret. And that is, being an incredibly enthusiastic fan of her classmate Souichirou. From his "good morning" until "good night", she closely watches him wherever he goes. His favorite food, his body weight & height, his bedtime and school courses, even the TV shows he watches, she is undoubtedly a fan who knows everything about him... Or rather, she has become his stalker completely... However, a boy who likes her chases her with the same type of infatuation appeared……!?