Resume : An English teacher named Seiji Hasumi (Hideaki Itō) is loved by his students and respected by his peers. He graduates from Harvard College with a MBA, and works at Morgenstern, a European investment bank, for two years. Hasumi returns to Japan to pursue high school teaching. However, his outward charm masks his true nature. In reality, Hasumi is a sociopath who is unable to feel empathy for other human beings. Specifically, he has a severe antisocial personality disorder. Having killed both of his parents at the age of fourteen, Hasumi turns into a fiendishly clever killer. During his time in the States, Hasumi meets a partner in crime who thinks he shares the same "hobby" as Hasumi – killing people for fun. Together, they kill many people. Hasumi eventually kills his partner. Back in Japan, Hasumi chooses to deal with problems like bullying and overbearing "monster parents" by systematically murdering. After a massacre at the school, Hasumi is caught by the police as two students escape. However, Hasumi plans to use his mental condition as his legal defence.