Asaishi Sousuke had lost his wife and was struggling with living alone. Seeing the father in such a state, the son Haruhiko and his wife Kurumi offered to move in with him, but Sousuke kept refusing. He was being stubborn, but there was another reason for his refusal.

It was his daughter-in-law, Kurumi. She was incredibly attractive and had married into the family while still innocent and sheltered. Sousuke harbored dark thoughts about this pure, untouched young woman.

She was his son's wife and would never be his. But he couldn't help but want to plunge his swelling pride into Kurumi. It was an impossible desire... until fate, or perhaps a devil's temptation, presented Sousuke with an opportunity.