The series is ostensibly set in modern-day Japan with the main characters hanging around the Buddhist college near Tokyo the main characters attended, though the characters often travel elsewhere for summer jobs or to fulfill their "clients" wishes. Tokyo, usually Shinjuku, is often visited though it is not known exactly where the college is located in relation to the greater Tokyo metropolitan area. The manga also seems to be set in the same universe as "MPD Psycho" and "Mail", other series that the authors Otsuka and Yamazaki respectively have worked on, as characters of these series appear in it.