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One day, the honor student's bookmark visits the house of a classmate, Yusei, who is hikikomori. It was my father Koji who greeted me. At first glance, he is a gentle mature man, but he is actually a former yakuza, and he has been involved in various back-office jobs. The bookmark passed through Yusei's room is circulated by Yusei and Koji. Yusei was also a collaborator of Koji and others, and such an act was fun and he did not go to school. I can't resist from fear and I'm left as it is, but masochism gradually grows ...