As a lackluster college student, Kentarou has never experienced the joys of companionship with a significant other. His memory gaps trouble him immensely since he hit his head, resulting in unexplainable behavior. One day, he awakens in a strange room with no recollection of how he got there. Lying next to him is an attractive individual that he has never encountered before. Kentarou is left to ponder: who is this person and what is happening?