Airi and Yukio, a college student couple, have moved into a new house to live together on the premise of marriage. - The boyfriend, who does not care that the walls of the house are thin, has intense sex with Airi, but of course, the noise can be heard next door and the neighbor is eyed. One day, when Airi is alone, a neighbor goes up to the house and says, "I want you to ask me one favor."