Kasumi Kirisaki (霧崎 かすみ Kirisaki Kasumi) is the little sister of the thirteenth diary owner, Azami Kirisaki. Wounded by Takao Hiyama, she is hospitalized, kicking off Azami's participation in the Tournament to avenge her.
Kasumi is a little girl with chin-length dark-brown hair and dark blue eyes.
She wears a blue and white dress with short sleeves and black leggings underneath.
Kasumi and a very sweet, lively and cheerful little girl who is very close to her family and she is very affectionate with her sister.
- Kasumi's surname Kirisaki means "fog, mist, haze" (霧) (kiri) and "cape, peninsula" (崎) (saki).