Tsutomu who usually only masturbates and shows no interest in other things. Chisato was only worried about such a boy. One day, Tsutomu got injured and came back from school, so when I asked him why, he said, "I got 0 points in the test, and I was laughed at, so when I got angry, I got into a fight." Thinking about his son's fate, Chisato decided to use his body to teach him to study so that he wouldn't get any worse.
