《3年A班：从现在起，大家都是人质》讲述了控制了毕业10天的高中3年级29名学生的美术老师柊一颯的最后一课的校园推理剧。菅田将晖饰演柊一颯，永野芽郁饰演因某件事而封闭内心的女学生茅野樱。10 days away from graduation, homeroom teacher Hiiragi, stands in front of his students and tells them they have now become his hostages. He says that no one can leave unless someone can tell him the reason behind a past student's suicide.
