S1, E6: Satsuki Kimura kills Noriko Matsuo, the only witness who could prove Bungo's innocence. Ai's story leads Shin to suspect Satsuki is responsible for the incident at Otousu Elementary School, but then Satsuki receives a box of juice laced with poison. Despite receiving a warning to stop pursuing the case, Shin and Yuki continue to search for the truth. Meanwhile, Shin gets a lead to the true culprit using Satsuki's notebook from Mikio Kimura and Bungo's recollection, but that was a trap set by the true culprit! He decides to meet the true culprit at the risk of his own life.