Japanese college students Enji and Rikuo have decided to travel to a foreign country to brave the mysterious "Devil's Cave", where a magic mineral called "Petram Magicis" is said to be found, which can grant any wish. But will they and their guide Shara be able to survive the supernatural perils of the cave? And why does Enji seem so obsessed with finding the Magicis, even at the risk of his life?