Kō Mukuroji fulfills the role of a department store concierge, presenting a professional customer service persona to the public. Whispers circulate regarding a concealed facet of his identity existing beyond this visible role, though the precise nature of this hidden side remains undefined. This persistent reputation contributes to a lingering sense of unease surrounding him.

No concrete details concerning his background, personal history, or character development outside the core series are provided. Official sources offer no further elaboration on the substance or consequences of the rumors about his concealed traits. Documented materials do not include expanded narratives, spin-offs, sequels, movies, or OVAs exploring additional dimensions of this character.