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Asumi is tiny and has lilac hair with twin pigtails 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 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 her father that Nariyuki is her boyfriend.
She hates to be mentioned as a "repeater"/Rōnin or mistaken as a middle schooler.
- Her birthday is on April 9.
- She is the only heroine to have a student identity card disclosed.
- She wants to attain a medical university because she wants to succeed in her father's career.
- She is an alumnus of Ichinose Academy, a grade higher than Nariyuki, Rizu, Fumino, and Uruka.
- She is afraid of glires, including rats and hamsters.