A VR tower defense game where players awaken as guardian spirits tasked with protecting the hidden treasure 'Crystal' deep within an underground shrine. Players must defend the Crystal from enemies attempting to steal it. They can summon ally units called 'Guardians' to aid them. The game progresses in waves, with powerful bosses waiting at the final wave. Clearing each wave earns Guardian Enhancement Energy, which can be used to level up Guardians, allowing players to overcome previously unbeatable waves.