A proud warrior who fought in countless battles, Seijun was savagely injured and left for dead when he and his fellow band of warriors were ambushed by a ninja clan. Seijun awoke long after the battle in a field overrun with the corpses of both friends and enemies, clutching the ninja leader's mask in his hand. Unable to cope with the loss of his fellow warriors and no longer able to trust his skills, Seijun turned to the bottle. He soon found that he was a superior fighter when under the influence, and that he finally remembered the face of the ninja leader. As Seijun began hunting the ninja who had ruined his life, this Warrior monk's drunken style made him an unpredictable and unusual opponent to all who faced him.