A married woman named Rei teaches at the same school where her husband works. One day, she receives a report that one of her students, Yoshikawa, seems lethargic according to her husband. The next day, her husband witnesses Yoshikawa bullying another student, Tanaka. In an attempt to protect Tanaka, he accidentally injures Yoshikawa. After school, Rei calls both students to discuss the situation but Yoshikawa threatens to tell the education board about the incident unless she shows him her breasts...