A special edition of the popular series has been released as a best-of edition. The intense moans and passionate, animal-like mating that could be heard every night made the wife's crotch ache. Her father-in-law may be old, but he has a strong libido, and every night he embraces his mother-in-law. He's a viper-man who will remain active his whole life. In comparison, her husband is indifferent to sex. The frustrated wife's Kokoro gradually turns to her father-in-law. She wants to be held passionately like that. Unable to suppress her desire, she goes to her father-in-law on her dangerous day to be embraced by him...