Ai Suru Koto wa Ikiteiku Koto

Modern technology boom made information intelligence agents - aces - appear. Among them the best of the best who can filter truthful information belong to class diamond.
This city is full of violence as it is, but recently serial murders break out. Main character is a private detective who does not even have enough orders to pay his rent. A woman appears requesting a job to be done. Is she a goddess of salvation or ...