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A boy came to see a detective in the Japanese Literature
Futaba Bunko / Tantei. "My friend's father has died. But I don't think it was suicide. Could you look into it?" -- The death of a famous university professor. There was a suspicion behind it about the excavation of underwater ruins in Okinawa Prefecture. Was the excavation a great achievement or a fabrication? It is a masterpiece mystery depicting the rivalry of people around ancient ruins. This is the second installment of the Tantei Ishigami Tatsuhiko series!