One day, Mari, a teacher, visited Yugo's house, a student who refused to go to school in her homeroom class, with her husband and fellow teacher Philosophy.The school had given up on Yuugo, who had caused a problem, but she came to visit him despite her objections.However, as soon as Yugo welcomes Mari in, he makes Mari and Tetsugaku drink tea with sleeping pills, and breaks Mari down in front of Tetsugaku.Her father Satoshi, a yakuza who appeared in the middle of her act, and his subordinate thugs, and the three of them circled the ball.