Motoko and Togusa begin investigating the original Think Pol developer, a Posthuman boy named Takashi Shimamura, and visit his old home to interview his mother. In the past, Takashi developed Think Pol and successfully used it to kill a teacher suspected of abusing a female classmate and leading to her death. After Motoko and Togusa leave, Takashi's mother finds Takashi somehow left his favorite blanket on the desk with a letter to her.