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The apartment building where Reika's daughter and her husband live is going to be demolished, so they'll live with Reika until they can find someone else. Reika, who had been lonely at home since her husband passed away, was happy to be living with her daughter and her husband. However, there was a slight problem with the couple's nighttime activities. The husband wants to have sex, but her daughter won't pay him any attention. That night, unable to do so, the husband drinks and masturbates. Reika finds out and scolds him. The husband says, "If you can't masturbate, then let me have sex with you, mother-in-law." Reika agrees, knowing it will be just once...