Haruka Isumi (亥清 悠, Isumi Haruka) is the center for the Japanese male idol group known as ZOOL. He has a sweet face, but behind that he won’t acknowledge those who won’t acknowledge him. He’s a self-centered high school student, who lives with his grandmother due to his parents passing after a car accident. He likes sweets, and dislikes effort. He is considered to be the 'failed experiment' by his former coach, who taught him to devalue his audience. He also seems to be quite childish.