Unryū is the main antagonist of Byakuren no Fangu. He is a Tosa used as a fighting dog in Japan. Unryū is first seen when his owner Anzai Nosuke takes him to Makoto's home to challenge the Yoshimura family's tosa. Zero (then the "tosa" puppy Chibi) rushes Unryū and is consequently the fighting dog breaks his leg. The Yoshimura family's tosa is critically injured trying to defend Zero, and Unryū walks away victorious. Makoto's father retaliates by bringing Zero to the Anzai home and allowing him to pay Unryū back with a bite to the leg. See more pictures in Unryū (Photo Gallery)