Mimina Ōsawa, a 19-year-old Hakureiryō Academy student, bears a youthful appearance reminiscent of a 10-year-old due to delayed physical development caused by a prolonged childhood illness and extended hospitalization. Her isolation during treatment led her to cultivate drawing as a solitary refuge, though she harbors quiet resentment toward external demands for her art, prioritizing personal creative projects.

Her relationship with Akiharu Hino begins with guarded hostility, shifting when he publicly advocates for her right to create solely for herself, prompting peers to respect her autonomy. This act sparks a gradual, unspoken emotional connection, which she masks beneath her reserved demeanor.

A practical exam injury sustained while aiding Akiharu becomes a turning point. His attentive care during her infirmary recovery fosters deeper affection and tentative trust. Later, her inadvertent participation in a sports festival’s suggestive hot dog-eating event contrasts her timid nature with comedic situational irony.

Subtle character growth emerges through quiet observation, such as covertly tracking Akiharu’s interactions during a group date—a blend of curiosity and veiled jealousy. An unresolved invitation to a waterpark hints at evolving social entanglements and latent romantic tension.

Physically, she stands out with blonde hair, orange eyes, and a heart-shaped Mongolian spot above her tailbone—a common Asian birthmark uniquely framed within the narrative. Her April 3 birthday aligns her with Aries traits.

Storylines intermittently weave her artistic passion into plot devices, such as structured tasks prompting her to draw, though these remain anchored to her self-directed ethos. Her arc remains contained within the main series, unexplored in spin-offs or supplementary media.