Yamagishi Kazushi is a 13 years old high school friend of: Takemichi, Takuya, Akkun and Makoto. He's a member of the first division of the Tokyo Manji (Toman) gang. His nickname is Gang-dex, he likes rumors about criminals, he doesn't like fighting, the person he respects or admires is actually Takemichi. His dream is to control criminals behind the scenes, his favorite place is Takemichi's house.