Fuuma Monou

Once a gentle and compassionate high school athlete, this character shares a deep, lifelong bond with Kamui as his close friend. Initially portrayed as a devoted son and a doting older brother to Kotori, his life takes a dark turn following Nataku’s violent raid on Kyogo. After the theft of the first Shinken, a deathbed revelation from his father uncovers his true destiny, marking him as Kamui’s fated twin star and establishing him as the series' central antagonist.