Yuta returns to his wife's hometown for the first time in a long time. He is always captivated by the beauty of his mother-in-law, Yuka, who has not changed over the years. That night, Yuta's wife leaves the house for a class reunion, and Yuka offers him a drink to ease his tension as they dine alone. However, Yuka ends up getting drunk herself, and unable to suppress her rising sexual desire, she pushes Yuta down and they end up having sex. The next day, Yuka regrets her drunkenness and tries to pretend it never happened, but she can't forget the pleasure she felt once she remembered it.