Sayuri, a teacher, visited the house of a student, Eusei, who refused to go to school. However, it was her eugenic father Koji and his younger brother Noboru who welcomed Sayuri. Koji puts him in a coma and hands him over to Eusei. Yusei was a fellow who performed bad shinogi with Koji, a yakuza. That night, Koji's colleague Kudo and his subordinate Nakata arrive. Koji makes the worst suggestion to Kudo, suggesting that Sayuri fall into her dark sex industry.
