They decided on Moriguchi's daughter Manami. His first public invention, an electric anti-mugger wallet, earned him a science fair award, but it failed to make the headlines, as the media was busy covering 'Lunacy Incident'.Shuya and Naoki's recollections revealed that Shuya said he had upgraded the anti-mugger wallet, and decided to try it out on someone, and roped Naoki in to help with his plan. He confessed that her abandonment had driven him to thrive in Science, from making small inventions to recording his killing and dissecting animals. Shuya Watanabe (Yukito Nishii), Student A, explained that his mother abused him before leaving to pursue her scientific ambitions. She decided to commit murder-suicide to free her son and herself from torment, but in the ensuing struggle, Naoki kills her.

His mother (Yoshino Kimura), after spotting the hidden malicious messages in well-wishes cards from Naoki's classmates, realized her son was somehow involved with an earlier incident. Naoki Shimomura (Kaoru Fujiwara), Student B, became a shut-in because he believes he had acquired AIDS from drinking HIV-contaminated milk. The rest of the film switches between the aftermath of Moriguchi's confession and the events before the confession through a series of first-person narratives from Moriguchi and her three students. So to inact revenge on them, she admits injecting her late daughter's biological father's HIV-contaminated blood in the milk cartons of the two students who she claimed to have murdered her daughter. She then went on to explain that two pupils in her class, whom she dubbed 'Student A' and 'Student B', had murdered her four-year-old daughter.She found a small bunny purse amongst Manami's belongings which should not have belonged there, which led her to question Shuya, one of her students, who immediately admitted killing Manami, and mocked her compassionate reaction to his feinted expression of remorse of 'just kidding'.Having revealed their identities, she explained that, because they, as minors, are protected by the Juvenile Law of 1947, turning them in wouldn't make a difference. Her daughter was later found drowned in a school swimming pool. One day, after school, she returned to the room where Manami was but found her gone. Moriguchi revealed that because the HIV-positive biological father of her daughter Manami was ill, she used to bring Manami (Mana Ashida) to school with her. Junior high school teacher Yuko Moriguchi (Takako Matsu) announced to her class that she would resign before spring break.

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