Yuka, a visiting caregiver, is having a hard time living, and she supplements her life with the price of having an old man rub her breasts at the place she visits. The grandson of the old man who secretly filmed it turns out to be a classmate of Yuka's son, Kosuke! When Kousuke was shown the video, he was shocked and took a strong interest in his mother, the woman who was closest to him. And Yuka gives sex education with her own body in order to teach her correct SEX to Kousuke, who has the wrong knowledge that she can have sex if she gives money like an old man.
