Previously Yusuke, Hiei, and Kurama were battling Kurama's demon siblings. It took all their strength, but they managed to pull through. Proceeding to the heart of the Crystal Caverns, they found the legendary Ziberian Crystals embedded in a piano. Sensing their legendary power to be real they were faced with the choice to take them or leave them. Not wanting to upset the balance of Demon World, they left the crystals safeguarded in the caverns and went on their way back to Zerka. But will coming back empty-handed be the most beneficial move for them to discover what they want to know?