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Asumi is a tiny girl with lilac hair that is tied in small twin pigtails with bangs hanging over her face and gray eyes.
When she is working in High Stage, she wears a maid uniform and introduces herself as "Fairy Maid A-shi-yu-mi-i". On other occasions, she wears a dress or a long skirt.
Asumi likes to tease Nariyuki Yuiga just for fun, although her jokes are usually harmless.
She will do anything that she can to pretend that she and Nariyuki love each other after Asumi lies to Soujiro Kominami that Nariyuki is her boyfriend.
She hates to be mentioned as a "repeater"/Rōnin or mistaken as a middle schooler.
- Asumi's surname Kominami means "small" (小) (ko), "beautiful" (美) (mi) and "wave" (浪) (nami).
- Asumi's birthday is on April 9.
- Asumi is the only heroine to have a student identity card disclosed.
- Asumi wants to attain a medical university because she wants to succeed in Soujiro Kominami's career.
- Asumi is an alumnus of Ichinose Academy, a grade higher than Nariyuki Yuiga, Rizu Ogata, Fumino Furuhashi and Uruka Takemoto.
- Asumi is afraid of glires, including rats and hamsters.