Middle school teacher Moriguchi Yoko's life comes crashing down after the murder of her 4-year-old daughter. Eventually, Yoko suspects some of her own students to have been responsible for her daughter's death. She comes up with an elaborate plan for revenge against the students who killed her innocent daughter. ~~ Adapted from the novel "Confessions" (告白) by Minato Kanae (湊かなえ).