"It's not corporal punishment, I'm just guiding the students." Kana and her husband, Shingo, work as teachers at the same school. They were spending peaceful days, but everything changed one day. Kimura, a delinquent student whose parents are influential figures in the prefecture, was bullying students and running wild. Ignoring her husband who was just watching, Kana, who has a strong sense of justice, ends up giving Kimura guidance that is on the verge of corporal punishment. Kimura, who holds a grudge against her for that, conspires with other students to defame Kana. Kana, who had compromising photos that she couldn't show to anyone, became Kimura's puppet from that day on...