Mori Arty enters the narrative as a transfer student at the end of the first season, seamlessly integrating into the story’s continuity in later episodes. Her stark black attire sets her apart visually, creating a deliberate aesthetic contrast with the rest of the cast. She engages regularly with the central detective team, openly expressing admiration for their work.

Her interactions are marked by a playful, exaggeratedly charming demeanor—often labeled “moest”—through which she delivers advice or petitions. These overtly endearing gestures, however, routinely cascade into chaotic or comedic mishaps that disrupt the detectives’ efforts. While her origins, true motivations, and loyalties remain ambiguous, her consistent presence implies a deeper thematic purpose within the series’ framework.

Functioning as both a catalyst for situational humor and unexpected complications, Mori Arty’s recurring role subtly underscores narrative tension without divulging her backstory or long-term intentions. Her documented appearances maintain this enigmatic balance, avoiding elaboration on expanded media roles or personal history.