ONA
Description
Kiyoko is the central character in the adaptation of Cinderella, where she reimagines the classic trope of the innocent heroine. She is the lone daughter of Viscount Otawara, living in a version of early 20th-century Japan. Following the death of her mother, Kiyoko actively encourages her father to remarry, expressing a strong desire for a new family. She is overjoyed when he brings Lady Tsuruko and her two daughters, Makiko and Sawako, into their home.

On the surface, Kiyoko presents herself as a cheerful, kind, and deferential young girl. She showers her new step-sisters with gifts, including her late mother's finest clothing and jewelry, and attempts to mimic their behavior to make them feel welcome. This outward persona of naive goodwill serves to highlight the perceived crudeness and greed of Makiko and Sawako, who are considered vulgar and ill-mannered due to their common upbringing.

Beneath this facade, Kiyoko possesses a dark and manipulative core. Her motivations are not born of malice or revenge, but of a desire for entertainment. She views the people around her as dolls or playthings in a game that she controls. Kiyoko takes great joy in engineering situations that expose her step-sisters' worst qualities, all while maintaining her own innocent act. When confronted, she feigns ignorance and fear, turning the household and her father against Makiko and Sawako. She speaks privately to a living doll she carries with her, revealing her true, sadistic nature and discussing her schemes as if they were a thrilling pastime.

Kiyoko's role in the story is that of a master strategist who orchestrates the downfall of her new family for her own amusement. She goes to terrifying lengths to keep her "game" going. When her father decides to send the troublesome step-sisters away, she eliminates him by tampering with his car to cause a fatal accident. After his death, she slowly poisons her stepmother, Tsuruko, while keeping her daughters away under the pretense of care, ensuring that Makiko and Sawako appear selfish and neglectful. Years later, she skillfully manipulates a ball hosted by Count Ichijo, humiliating her step-sisters in public and captivating the Count's son, Masataka, whom she then marries.

Her key relationships are all defined by this transactional need for control. Her father is an obstacle to be removed, Tsuruko is a "broken doll" to be discarded, and her step-sisters are her primary playthings. She derives pleasure from their misery and resistance, finding their attempts to outsmart her to be the most thrilling part of the game. In a final twist, Makiko and Sawako manage to escape her clutches by deliberately playing the role of villains, convincing the Count to throw them out and inadvertently freeing themselves. Kiyoko, however, is undeterred, quickly setting her sights on her new husband, Masataka, as her next toy. Her most notable ability is her chilling capacity for psychological manipulation, patience, and complete lack of empathy, allowing her to orchestrate elaborate social traps, and when necessary, murder, all while appearing utterly innocent to the outside world.