Sayuri, a teacher, visited a student / eugenic house who refused to attend school. However, it was Yusei's father, Koji, and his brother, Noboru, who welcomed Sayuri. Koji goes into a coma and presents it eugenically. Yusei was a junior who was doing good shinogi with Koji, a yakuza. That night, Koji's colleague Kudo and his subordinate Nakata come over. Koji has made the worst proposal for Kudo to sacrifice Sayuri into dark customs.