The series centers on Yui Yūri, the daughter of a death row convict imprisoned for enacting the "greatest terrorist attack in the Heisei era." At... more>> the time, Yui was nine years old, and was judged not to have been involved in her father's activities. Now she is a second-year high school student at Takekura Kosugi High School, where the Japanese prime minister and his security detail are conducting a visit. But a paramilitary force assaults the school and takes the prime minister and the students hostage, without issuing any demands. In the middle of the crisis, Yui tries to find a way to get out. <<less