Chiyuki is an amnesiac woman taken in by Nona to Quindecim and hired as Decim's assistant. She is a young woman, with shoulder-length hair black hair, and light violet eyes. Her complexion is fair, and while isn't deathly pale, contrasts well with her cherry-tinted lips. Her slender and semi petite figure is accentuated with a black crop top, a mini skirt held by a white belt, and ankle strap heels. She accessorizes with a necklace and a white bracelet.

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It is later revealed that she is actually a human and a talented figure skater who committed suicide due to depression induced by an injury that ended her figure skating career.

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She is sent back for reincarnation in the last episode.