an, akito, tsukasa and rui are detectives, working for an agency. mizuki is a villain- a phantom thief. though, what nobody knows is that tsukasa is actually secretly a spy for mizuki and only works for the detective agency as a source of info. rui is his companion in the agency but also secretly tsukasa is both scared of him (rui is always serious at work) and needs to eliminate him according to mizuki. tsukasa is a loud and open person, and everyone trusts him. nobody knows of his identity.