Akane Misaki is a schoolgirl who has started living alone. Due to a mistake by her landlady, the same apartment was rented by her and Ken Hazama, a salaryman. The two come to an agreement that they will only live together for a week until another apartment becomes available. That same night, Akane hears that they are having sex in the apartment next door, sounds that make the teenager very horny. On the other hand, Ken realizes that Akane was masturbating and then…