A fantastic story about centuries gone by. The story is about monsters that were defeated by humans and sealed them in the mountains, there they lived and could not get out. There are also Hayato, Chihoro and Suzana, who are essentially monsters too, but want to fight on the side of humans, so they find new monsters every day and seal them up. But one day comes the evil news that the monsters from the mountain want to get out and now our warriors must go on the road to stop this evil prank...