Who Killed Daigoro Tokuyama?

Season 1, Episode 2: I Want To Cheat

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The students of Grade 3 Class C (Keyakizaka 46) receive a message from their dead homeroom teacher, Daigoro Tokuyama. They search for him and find that his cell is gone. Yurina Hirate (as herself) believes the murderer sent it. As they return the body to the locker, Hashibe, the janitor, comes to the classroom saying Tokuyama sent him a message.