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Sogen Mystery Bunko / Kanko University Mystery Lovers Association Chairman Kyosuke AKECHI of 』, 『's famous detective, and his assistant, Yuzuru HAMURA visit Pension Murasaki 湛荘 to participate in the summer camp of Eiken. On the night of the first day, they were forced to stay in the castle due to an unexpected situation, but it was only the beginning of a series of murders. In just one and a half hours, the world changed completely. This is the 27 th Tetsuya Ayukawa Award winner of the mystery ranking! Kenzaki