Haruki Nakajima, or "Haru" as close friends call him, is a dedicated and passionate senior high school professor. Despite being only 26, he carries himself with a maturity and calm that commands respect. Generally reserved, he harbors a secret affection for one of his students, which he carefully conceals behind his professional demeanor. Standing tall at 184 cm, Haruki's intelligence, subtlety, and mix of shyness and confidence make him an intriguing and multifaceted individual.