Monami, who lost her husband, lives with her son. Katsuji, the heir to the landlord, notices Monami's large breasts. Monami's part-time income is not enough to cover her living expenses, and she falls behind on her rent. Katsuji claims to be there to collect the overdue rent, but from the beginning he has been attracted to Monami's voluptuous body, and approaches her with his bad friends.