Shoushimin Series

The story centers on Jougorou Kobato, who wishes to live a quiet and ordinary life after a painful experience. He and Yuki Osanai form a "mutually beneficial relationship" as Yuki also wants the same thing. They start high school as classmates with a plan to spend their peaceful days as ordinary people, but unfortunately they keep getting wrapped up in mysteries and disasters as they happen one after another.

(Source: Anime News Network)