Kurumi Kawai is a third-year student at Minamigaoka High School with light brown hair, green eyes, and a height of 163 cm. Born on October 16, 2000, she falls under the Libra zodiac sign.

She serves as vice president of the Photography & Arts Club, managing its finances and budget. Her cheerful, fun-loving personality and intense curiosity make her popular among juniors, often leading her to become overly helpful in situations she finds intriguing.

Kurumi witnesses Hitomi Tsukishiro leaving Yuito Aoi's room, records the incident, insists on their romantic involvement, and uploads the footage online, sparking rumors and demonstrating her tendency to jump to conclusions.

Within the club, she frequently bickers with youngest member Chigusa Fukasawa, though their interactions imply underlying fondness. She also advises Asagi Kazeno about Asagi's unrequited feelings, showing supportiveness. Kurumi deeply admires her elder sister and strives to emulate her.

During a nighttime rooftop photography session where the club experiments with monochrome techniques, she supports Hitomi as Hitomi reveals her achromatopsia and time-travel origins. Despite her outgoing nature, Kurumi harbors a significant fear of ghosts.