Chiyuki

Black-Haired Woman (黒髪の女 Kurokami no Onna), who is referred to as Onna, is an amnesiac woman taken in by Nona to Quindecim and hires her as Decim's assistant.

Appearance
Onna is a young woman with violet eyes. She has shoulder-length black hair with a streak of white in her bangs. 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 herself with a necklace and a white bracelet.

Personality
She appears to be innocent but doubtful to everything when she first woke up. However after she got used living in Quindecim, she appears as a strong-minded individual who always says what is on her mind whenever necessary. She does not hesitate to oppose Decim if she feels there is something wrong in what he says. Also, because she retains her humanity even when all her memories are lost, she can give valuable insights to Decim whenever he is judging.

History
Onna was originally one of Decim's customers. However, unlike other humans who has no memories when they arrive at Quindecim, she has hers intact and knew the fact that she was dead. For this reason, Decim could not provoke her into playing a Death Game and with Nona's permission, he had her memories erased and extended her judgement period. After that, she was allowed to stay in Quindecim and assist Decim in arbitrating.