Introduced in the second season, Miki is an idol professionally affiliated with Peach Maki's idol office in Hell, working as a performer within the underworld's entertainment industry. This affiliation places her alongside Peach Maki in Hell's idol activities.

Her background includes signing with Maki's agency, establishing her within the afterlife realm's structured idol framework. This connection defines her role and activities within the narrative.

Miki participates in idol events and duties, including public appearances and promotional activities such as autograph-signing sessions, though the context of Hell significantly alters these engagements.

Her experiences involve adapting to Hell's distinctive work culture, gaining a deeper understanding of operational demands placed on underworld staff during her activities. This exposure contributes to her character development while navigating her profession's complexities.

Miki's portrayal remains focused on her idol role throughout her appearances, without expansion into personal backstory or significant evolution beyond her professional function. She is consistently defined by her occupational position within the established idol framework.