“Kyo, isn’t it about time you gave us a grandchild?” His father-in-law’s request leaves him shaken. What was meant to be a cheerful family hot-spring trip turns into a planned chance for him and his wife to conceive. He observes a full month of abstinence as instructed, only for his wife to reject him when the trip finally arrives. Frustrated and desperate for relief, he wanders through the inn and accidentally catches sight of his mother-in-law bathing, setting off an affair in which he loses control and repeatedly creampies her—with consequences he can never confess to his wife.