|Hometown||Meguro Ward, Tokyo|
|Manga Debut||Line 33; Children (Mentioned)|
Kaori Sumimori (住森 香織 Sumimori Kaori ) is one of of Mayu Sumimori's older sisters.
Kaori is a young woman who is, as noted by Mayu, very beautiful. Kaori takes after both of her parents, she has light-colored hair from her father and facial traits from her mother. Her hair is straight and short, to about ower chin-length, with long bangs covering her forehead. She has light-colored eyes and long eyelashes.
Kaori is presumed to live with her family in Tokyo. As Mayu claims, her father won't let Kaori or his other daughters except for Mayu to rent an apartment, and he also told them to commute from home and come back home even when they married. Kaori and her other two sisters are very fawned about by their father.