Since getting married, Takeshi has been reluctant to have sex with his wife, who has been clinging to him at night. The reason is that he is preoccupied with the sex appeal of his wife's mother, Ruriko, who lives with them. Even though he has a wife, he knows it's wrong to be attracted to the beautiful and seductive Ruriko... But Takeshi can't suppress his desire to hold her in his hands, and he ends up peeking at Ruriko as she gets changed...