Kaori Kamichika is a second-year student at Seio Girls' Academy who transferred into the dormitory mid-term. She shares a grade level with Kaoruko Nanahara. While she maintains friendly ties with her dorm mates, a poor reputation among the wider student body causes most of her peers to keep their distance. This social isolation stems from persistent rumors regarding her sexuality, which hold a basis in truth. Those who befriend her, however, discover a person of remarkable maturity and steadfast reliability. She enjoys teasing these close companions.

Kaori is a lesbian and holds secret meetings with several students from lower grades, including a confirmed relationship with Reika Mizusawa. She possesses long blonde hair, typically worn in a braid or side tail with spiky bangs, pink eyes, and a slim figure with a large bust. She stands 166 cm tall, was born on August 24, and has blood type AB.

Her perceptive nature leads her to quickly uncover the secret that Chihaya Kisakinomiya is male. She agrees to keep his secret on the condition that he does not reveal her own romantic preferences, and she goes on to provide him consistent support during his time at the academy.