A crisis comes to visit the joyful lives in the world of the monsters. Unawared attacks of the Gorgons decreased the populations of the monsters significantly. The monsters needed cooperation and supports for their peace and safety. Therefore, they formed UM: United Monsters, to fight back against the Gorgons. The newly elected secretary general of the UM, 'No.202,' declares full attacks on the Gorgons. In order to counterattack the Gorgons, UM creates a powerful weapon called, 'Head Hunting'. The weapon steals the masks of the enemies and steals their abilities. The monsters that used 'Head Hunting' obtained powerful strengths. The table switched after the successful tactics of the UM. The Gorgons start to die out one by one, and the peace comes to the World of the monsters. Playing the horns of their victory, the monsters march to fight the final boss in the Land of the Dead. However, as soon as they face the final boss, they all turn into stones...