Kentarou is a plain, nondescript college student who has never had a girlfriend or any friends. After getting hit on the head by a wayward ball, he begins to notice that there are increasingly long periods of time in which he cannot remember what he was doing.<br /><br />One afternoon, he regains consciousness in an apartment he'd never been to before - and sitting next to him is a young man who then tells him "You're being possessed by the spirit of my dead girlfriend"...