Our world hides another, dominated by powerful and dangerous monsters. When Lieutenant Artemis and his elite unit pass through a portal that transports them to this parallel world, they suffer the shock of their lives. In a desperate attempt to return home, the brave lieutenant meets a mysterious hunter, who has survived in this hostile world thanks to his unique skills. Facing terrifying and relentless attacks from monsters, these warriors team up to defend themselves and find a way to return to our world.