"It's not corporal punishment, I'm just guiding the students." Kana and her husband, Shingo, are both taking up teaching positions at the same school. Their lives are peaceful, until one day, everything changes. Kimura, a delinquent student whose parents are influential people in the prefecture, goes on a rampage, bullying other students. While her husband stands by and watches, Kana, with her strong sense of justice, gives Kimura some instruction that borders on corporal punishment. Holding a grudge against him, Kimura conspires with other students to belittle Kana.