Newly hired teacher Satomi discovers that one of her students, Hiro, has been refusing to attend school. While the school has abandoned him due to his behavioral issues, Satomi defies her colleagues and decides to conduct a home visit. When she arrives at Hiro's house, he quickly serves her tea laced with sleeping drugs and overpowers her. Immediately afterward, Hiro's father, a yakuza named Koji, appears with his gang of thugs, and Satomi is surrounded and dominated by the three men. This incident becomes a brutal test of her strength and convictions as an educator.