Haja no Fuuin is an action role-playing game for the Nintendo Entertainment System. Players control a young hero tasked with stopping the resurrected Dark Lord Terarin, who has unleashed evil upon the land. Accompanied by three companions, Guy, Medi, and Treo, the hero must locate mystical weapons and three keys to Terarin's lair, ultimately striving to reseal the Dark Lord and restore peace.
The seal of the Dark Lord Terarin has been broken and Terarin has been unleashed into the world again. She has stolen the Golden Seal and opened pandora's box, unleashing evil creatures into the world. A young hero is tasked by a king to stop Terarin. He must step into footsteps of Iason, a shepherd that once accidentally unleashed Terarin and fought to seal the Dark Lord again. The hero must enlist the aid of three companions, Guy the warrior, Medi the amazon and Treo the pirate (called Turo in the manual) and find the three keys to Terarin's lair. To face the Dark Lord, they must find the mystical weapons and armor of old and then defeat Terarin and seal the Dark Lord from the world.