Hanako-san, Tabenaide

A boy named Tooru has stopped going to school due to a certain incident, and continues to lament his current situation of simply living by inertia. One day, Tooru learns that his alma mater, Hanakaze Elementary School, is going to be closed. In a panic, he finds himself trespassing on the school grounds. Just when he thought there was no one there... he finds Hanako-san, the girl who used to play with him in the toilet!? Tooru is flustered by Hanako-san's aggressive approach. And there's more to this school than just Hanako-san...?! Wouldn't you like to be loved to the core by the Hanako-sans? A slightly naughty tale of adolescence. (Source: Kadokawa, translated)