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。Art Teacher, Hiiragi Ibuki, has worked at his current school for 2 years. He is the homeroom teacher of Class 3A. With only 10 days until graduation, Hiiragi stands in front of his 29 students and tells them "From now on, you are all my hostages". He starts his lesson, which will only end if someone can tell him the reason behind a past students death, who had committed suicide a few months before, but if they give a wrong answer, someone will die.