Japanese literature Graduation time limit Futaba Bunko

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Japanese Literature
A popular high school teacher has been kidnapped and will be killed in 72 hours, according to an online video. A third year student, Kurokawa, receives a challenge saying, "Solve the mystery of the kidnapping." He joined an athletic man, a beautiful woman in the first grade, and a classmate who was a childhood friend. Behind the incident is an unexpected truth. 『, this time limit mystery that depicts the light and shadow of youth sent by a writer who was a winner of the Miss 』 Grand Prize!