Yama lived a peaceful life among the gargoyles and humans of Ishimura, Japan. In 1996, he betrayed the clan by aligning himself with a human named Taro, a former student of Kai's, who claimed to be creating an theme park about gargoyles to spread Bushido to the children of the world. To that end, Yama planned in secret with Taro to move the clan from Ishimura to the theme park. After this plan began to unfold, Clan Ishimura met the Avalon travelers.