Rin and his friends, along with the rest of True Cross Academy Town, are in the midst of preparing for a festival that is celebrated only once every 11 years. While the barriers protecting the city from demon intrusions are being repaired, Rin and his twin brother Yukio are sent to the scene of an exorcism as reinforcements. Things take a turn for the worse and as they attempt to salvage their mission, they meet a mysterious young boy that may threaten everything that they know. Meanwhile, Cheng-Long Liu, a First Class Senior Exorcist from the Taiwan Branch, joins the 'simple' repair operation that forces his fate to cross with 'Satan's spawn', Rin...