It's been six years since Abe's wife left home. His son Wataru, whom he has been raising alone, failed the entrance exam and is now in his second year of retakes. Wanting to make sure his son passes next year, Abe asks his colleague Honjo's wife, who has experience as a private tutor, to tutor him, but... the woman who turns up is a beautiful, busty wife with plenty of sex appeal who is too much for the scruffy, male-dominated Abe household.