Hirokawa Eiki is an investigator for Rose Life Insurance. When Egi Touko's husband dies, Eiki is dispatched to investigate whether the husband's life insurance plan is valid. However, he becomes suspicious as he realizes that Touko has just become a widow for the third time and that she was the beneficiary for the life insurance of all her husbands. Similarly, detective Ujou Takeshi, who is investigating the murder of Touko's coworker, also connects the dots and rushes to uncover the truth. The two men soon find out that there's a lot that's hidden under the surface and that not everyone can be trusted.