Don't Eat Me, Tokiwa-kun.

Mizutani, a high school boy who can see non-human beings, meets "Tokiwa-kun" after saving him from a supernatural phenomenon. Tall, a little gloomy, lonely, clumsy...and honest, Tokiwa-kun makes Mizutani increasingly interested in him. But one afternoon after school, in a classroom trapped by something... "It's okay not to be scared, will you kiss me?" Tokiwa-kun suddenly changes...!?