Nai is searching for a guy named Karoku but his only clue to the latter's whereabouts is a bracelet. He meets a thief named Gareki whom he was forced to pair up with to escape a setup in a mansion. Later in the story, Nai and Gareki meet the members of Circus, a defense organization. This meeting introduces them to potential allies as well as place them in danger for coming under the watchful eyes of another organization. This seems to be a clue to Nai's past and the identity of the man he has been searching for.