桧森 蛍

A third-year student at Hokkaido Kumakawa Agricultural High School. Though sharp-tongued, Kei is a kind and gentle boy at heart. Hokkaido is also Haruho's birthplace, and was her place of residence until her third year in primary school. Kei is her one-year-senior childhood friend. Since they were neighbours, they came to know each other through their families.