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Kei University's Mystery Club students decided to take a trip to Tsunojima Island, which was notorious for the bloody murders that had occurred there half a century ago. Seiji Nakamura was the previous owner of the island, and he lived in a blue mansion along with his wife, a gardener, and two housekeepers. One day, the entire mansion was set on fire and four bodies were found. The two housekeepers were brutally killed together, while Nakamura and his wife were both found in the bedroom. The body of the gardener was never found, so it was suspected that he killed them all, set the house on fire, and then escaped the island by boat. No one was ever able to find him, though.