Ep. 5: Legend of Lake Hiren Murder Case File 2

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Hajime suspects the killer may be one of the member of the group itself. Eiji Touno leaves by boat to get help, but the boat returns with his body. That night, the artist Seiji Kobayashi is killed. Hajime discovers that all of the guests are survivors of the sinking of the Oriental ship that happened three years ago. (Source: Wikipedia)