In the kingdom of Eren, a grand structure called the Crematorium served as the final resting place for the dead. However, it fell into disuse and was abandoned. Strange occurrences began to happen as the dead rose and dark creatures appeared. The king called upon the Dragon Knight to investigate and restore peace. The knight uncovers that the Crematorium is controlled by the sorcerer Lithos, who seeks to build an undead army. The knight braves the dungeon's dangers, meets lost souls, and must confront the sorcerer to save the kingdom.