Who Killed Daigoro Tokuyama?

Season 1, Episode 4: I Want To Search

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Three days since they've hidden the body of their homeroom teacher, Daigoro Tokuyama. Their sub-homeroom teacher, Kanzaki (Noriko Eguchi), takes over. The students grow suspicious about Kanzaki and each other. Suddenly, Yashiro , a detective, appears. The students are scared they've been busted, but he asks them instead about another curious incident...