卒業式の日、「担任生徒の誰か」に突き落とされた教師が、1年前の始業式の日に時を遡ったことから、自分を殺害する「30人の容疑者」である生徒たちと向き合い、再教育する物語。
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Kujo Rina is a chemistry teacher and the homeroom teacher for the 3rd grade D class at Horai High School. She doesn't have a bond with her students. On the school's graduation day, Kujo Rina is pushed from the 4th floor and falls down. She is able to glimpse a school uniform sleeve on the person that pushed her. At that time, she wonders why she was pushed and that she does not want to die.
The next moment, Kujo Rina is standing in front of her students, and she has travelled back in time to one year earlier. She knows that one of the 30 students in front of her will try to kill her in a year. To find the truth about what will happen and to avoid her death, she approaches her students with all her heart. Meanwhile, Ugumori Kanau is one of Kujo Rina’s students in the 3rd grade D class. She is a model student, but she experiences a miserable school life due to her classmates targeting her.
凤来高中3年D班的班主任九条里奈，是放弃贴近时代、贴近学生的化学教师。毕业典礼那天被“班里的某个学生”推下去，然后时光倒流，站在讲台上，眼前看到的是一年后杀害自己的“30名嫌疑人”。她下定“决心”，颠覆教室、人生，冒着生命危险挑战面对学生。
畢業典禮當天，目送學生的老師九条被推下4樓。「我不想死！」內心的強烈呼喊讓她奇蹟般地回到開學當天的教室。為了查明真相，九条費盡心力面對眼前的30名學生，因為他們... 是在1年後將會置她於死地的30名嫌疑人。
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