These extensive underground ruins have been controlled by the Tenshodo for many years, its secrets known only to a select group of researchers. Archaeologists believe the grand hallways and countless chambers are the remains of a city populated by the ancients. However, the existence of numerous traps within the ruins lead others to dispute this theory. Reliefs that exhibit geometric patterns and avatars in recurring themes can also be found carved into the walls in several areas. The origins of these carvings still remains a mystery.What lies behind the Tenshodo's sudden decision to open the ruins to adventurers...?