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Adapted from the novel "Mon Kammatep" by "Orasa Tossanut".

A series of suspicious deaths, starting with that of her boyfriend Kawazu Masayuki, prompts mystery novelist Yuki Rikako to investigate. She discovers that all the victims were once passengers on the same cruise ship a year ago and involved in an accident that left one man dead. Rikako must find out what really happened during that outing before more casualties result.