Who Killed Daigoro Tokuyama?

Season 1, Episode 9: I Want To Break

Select Source

6 days since Tokuyama died. Tomorrow is the school festival. Class C is doing a haunted house. They consider using Tokuyama's corpse for the event. Just then, the new principal Kazusa Midozono comes in. The students are alarmed that the former principal Sangubashi has suddenly quit. Midozono asks about Tokuyama since something strange was written in his planner.