Koori no Sekai

Eiki, works for an insurance agency. He's seen various terrible things in his line of work and how far people will go to get the insurance money. One day, he is sent to investigate Touko who lost three fiancees under strange circumstances. Trying to figure out if there was foul play or if all deaths were an accident, Eiki decides to take it upon himself to investigate even though detective Takeshi is already on the case. As Eiki gets closer to Touko, he falls for her and the two of them become involved. That in turn puts his life in danger when someone tries to kill him... and he still doesn't know is Touko herself is the killer.