He succumbed to madness after his wife and child were killed by bandits and formed an army to conquer the wasteland. When he invaded the slave town, Gesso City, he fought against Kenshiro but was soon defeated. In his final moments, Jugai rewarded Kenshiro with the remote detonator which Siska used to control the city, and vowed to watch Kenshiro's destiny from the depths of hell.