Inertia is a well-mannered girl who first appears in the hospital that Kino is requested to visit, reading a letter. She is described in the novel as a girl with pure white hair, long blond hair that touches the bed when in a sitting position, blue eyes, and a thin face. Instead of a hospital gown, she wears pajamas with a red and blue tomato pattern, with a pink cardigan on top.

She's in correspondence with a boy named Rogue who lives in an undeveloped land and wishes to see him when she recovers from her illness. She writes to him every month.

(Source: Kino's Journey Wiki, edited)

The film adapts a story from volume 5 of the Kino no Tabi light novel series and tells of another country Kino travels through. 

__Non-anime roles:__
- Shenhe - Genshin Impact (VG)
- Sugar - Goddess of Victory: Nikke (VG)
- Dikke - Reverse: 1999 (VG)