3年A組 ―今から皆さんは、人質です― (3年A班：从现在起，大家都是人质 特别篇)
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With graduation 10 days away, homeroom teacher Hiiragi gathered all 29 students of class 3-A and proclaims them his hostages. His last lesson regards the death of a student that passed away a few months before. Nobody will be able to graduate until the truth is known.