Nagayoshi Takeru

This is the story about a boy who meets a girl on a train... but the girl can't leave the train and an evil organization will do whatever it takes to keep her on said train.

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–and this is 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 17-sai!! was published before Sumire 16-sai!!

Sumire is a 17 year old high school girl who wants nothing more than to make friends with her new classmates. She's so dissappointed that they all seem to hate her, calling her a pervert, a dirty old man, creepy, weirdo… alas, what is a poor lifesized puppet to do in this cruel world. Sumire 16-sai!! was published after Sumire 17-sai!!