While bicycling to school her first day as a high school student, Renge Ohyama meets a weird girl who on closer inspection appears to be a life-sized doll--not an advanced robotic creation or even a magical doll. Rather, a scary looking middle aged man controls her movements, puppet-like, and speaks for her via ventriloquism. Unfortunately, this perverted-seeming old man and his doll happen to attend her new school. Even worse, is in the same class and sits right behind her. And it seems the doll wants to be friends?!

Sumire is a 17 year old high school girl who wants nothing more than to make friends with her new classmates. She's so disappointed that they all seem to hate her, calling her a pervert, a dirty old man, creepy, weirdo... alas, what is a poor life-sized puppet to do in this cruel world.