Our Last Crusade or the Rise of a New World: Secret File Novel Volume 3 was written by Kei Sazane with illustrations by Ao Nekonabe.

A host of secrets are revealed when the Empire and Sovereignty conduct a surprise inspection of personal belongings! After Rin collapses due to illness, Alice and Sisbell travel to a legendary mountain to find a cure. The story of how Johaim swore allegiance to Elletear as her knight is detailed for the very first time. All these tales and more await in this third volume of short stories centering on the cast of Our Last Crusade.