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.
Saigo Takamori, the hero of the Meiji Restoration, was born to a poor, low-ranking samurai family in the Satsuma domain (present day Kagoshima Prefecture). His simple honesty caught the attention of its charismatic feudal lord of Satsuma, Shimazu Nariakira. Nariakira’s assertion that the love of people is what will enrich and strengthen the nation captivated Saigo who took on Nariakira’s secret mission and eventually became a key person for Satsuma. Not a portrait of him survives today and much of his life is a mystery. He is a man who was twice exiled and thrice married. He overthrew the Tokugawa Shogunate with exceptional bravery and action. Although he accomplished the restoration, he lost his life in a fight with the new Meiji government.
Based on the novel "Sego Don" by Hayashi Mariko.
