Kaoru Shindo belongs to SARG—alternately known as the Gaichi Security Force or Gaikei security force—which operates exclusively within the 24th Ward. As a junior member of this organization, Kaoru reports to senior officers Wataru Chikushi and Hana Shishido. The surname Shindo (進藤) merges "advance, make progress" (進) with "wisteria" (藤), while the given name Kaoru (薫) signifies "fragrance" or "fragrant."