Ataru, a son, is asked by his mother to greet a friend who is coming to stay at her house. I thought, ``I wonder what kind of lady would come because she's my mother's friend,'' but the person at the meeting place was Hisae, a beautiful mature woman who doesn't even look like her mother. Ataru gets nervous because of her beauty and runs away to her room. Unable to suppress his rising sexual desire, he begins masturbating without his girlfriend, Hisae, but Hisae witnesses him. However, Hisae, who was excited by the cock she had seen for the first time in a while, couldn't hold back her frustration and begged him to show her more.