Anime Film - Demonion Gaiden 02

Once upon a time, a demon named Astaroth invaded the human kingdom, bringing the entire world into conflict. He was eventually defeated by a group of heroes who seized his abilities and imprisoned him far underground. There were rumors two hundred years later that the seal had been shattered due to recent movements in the Earth's crust, and that the demon had been resurrected. Many brave adventurers descended on Astaroth's underground labyrinth in the hopes of defeating him and gaining fame. They had no idea that he had created a trap for them...