A demon lord named Astaroth once invaded the human kingdom, plunging the world into war. However, he was eventually suppressed by a group of heroes who took his powers and sealed him deep underground. Two hundred years later, rumors circulated that the seal had been broken due to recent shifts in the Earth’s crust and that the demon lord had been revived. Many confident adventurers descended on Astaroth’s underground labyrinth with the intention of defeating him and becoming famous. Little did they know that he had set a trap for them…