After an extended period of containment, geological disturbances free a once-feared demon from his deep resting place. News of this event spreads rapidly, prompting numerous adventurers to seek out the subterranean complex in pursuit of fame and fortune. In this opening episode, these explorers step into the unknown, where carefully laid plans begin to unfold against them. Their journey reveals the intricate defenses awaiting any who dare to challenge the revived power.