Kinu was doting on her grandson Toshiya. She would secretly give him pocket money or clean his room for him. For the sake of her grandson, she would do anything, eagerly taking care of him. One day, Toshiya noticed that Kinu had an erection upon seeing him. Kinu, who knows everything about her grandson, decides to take off her clothes and help him after realizing he's a virgin. She tells her cute grandson, "Should grandma graduate you?"
