Groom Koji lives with his wife and her parents. The in-laws interfere, asking the childless couple, 'How's the baby-making going?' Koji replies that he has no sex drive, but the truth is he's been captivated by his mother-in-law Yumi's obscene breasts! Koji's desire for Yumi reaches its limit as he pounces on her naked breasts while she's bathing. Koji's advances escalate as rationality flies out the window, and Yumi, who has also been struggling with her mature body, gets sucked into the affair...
