Mihari Otosuna is the editor for manga artist Yūki Aito, a professional role stemming from their history as high school classmates. Her full name forms a deliberate pun on the Japanese phrase "Don’t-Be-Late-With-The-Final-Draft," directly referencing her editorial duty to enforce deadlines.

She stands 155 cm tall with a small, thin build. Mihari experiences significant self-consciousness about her A-cup breast size, a persistent complex that surfaces during situations involving physical comparison, such as communal bathing. Despite this insecurity, she harbors a personal fondness for cute aesthetics, which she actively conceals.

Mihari combines a quick temper with strong professionalism. She frequently responds to Aito's irresponsible work habits or overtly perverse behavior with physical aggression, using wrestling moves or direct strikes. This volatility coexists with demonstrable loyalty; she exhibits tolerance regarding his deadlines, recognizing his underlying talent, and consistently encourages his potential. Beneath her hostile demeanor, she maintains unresolved romantic feelings for Aito dating back to high school, a sentiment he occasionally teases her about despite her persistent denials.

Available media explores her background, including an episode detailing her early experiences as Aito's editor. This reveals the reason behind her decision to cut her hair short, a change linked to her high school past when she had long hair. This provides context for her current identity and her complex interactions with Aito, where hostility masks underlying care. Her role frequently positions her as the pragmatic counterbalance within the creative team, offering practical solutions during challenges.