Sayuri, a female teacher, visits the home of her student Yuki who has been refusing to attend school. However, she is greeted by Yuki's father, Koji, and his younger brother, Noboru. Koji is in a semi-conscious state and hands Yuki some drugs. Yuki is involved in criminal activities alongside his yakuza father Koji. That night, Kudo, one of Koji's associates, arrives with his subordinate Nakata. Koji makes a heinous proposal to Kudo—exploiting Sayuri by forcing her into the underground sex trade.