As the power of the Heavenly Book dissipates, a disaster will befall the protected place "Dunhuang". Wu Tianji is ordered to repair the Heavenly Book. In order to improve the power of the Heavenly Book, she needs to re-experience the stories originally recorded in the Heavenly Book. Wu Tianji brought her divine beast, the Angel Pig, to the ancient city of Dunhuang. Just when she was at a loss as to how to start repairing the Heavenly Book, she accidentally entered the mural world of Mogao Grottoes...