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.
Elite researcher Suenaga Takuya, his department rival Hashimoto Atsushi, and Manager Nishina Toshiki plot to kill Amemiya Yasuko, the CEO's secretary and a shared mistress, whose pregnancy threatens to destroy their futures. However, their plan unravels when a mysterious 4th individual becomes involved, and the 3 men become the targets of wrath instead.
A woman (Takako Tokiwa) risks her life to exact revenge for her murdered lover.