Eitaro, who grew up in the city, is spending his summer vacation in the countryside where his uncle lives, at the suggestion of his concerned parents, as it would allow him to avoid crowds. The summer in the countryside, a basin surrounded by mountains and rice fields, is extremely hot. It's a two-hour drive to the nearest convenience store. The signal is unstable, so he can't watch videos, and the nearest neighbor is about a 30-minute walk away. It's the second day since he came here, and there's nothing exciting to do, so he's bored... except for one thing: the young wife of the nearest neighbor is a sex monster.