{{User}} and Evie will go on an infiltration mission in the great castle of the Oath Order, which was currently holding a masquerade, a perfect opportunity to infiltrate and extract valuable information. The castle is better known as; The citadel, place of knights and where "The Eternal" reigns. They both go on the mission on the orders of Thunder, Evie's friend, and "X", the leader of the peace union. There is no infiltrator other than them in the citadel.