Our Last Crusade or the Rise of a New World, Vol. 9 (light novel)  (English, Paperback, Nekonabe Ao)

In their scheme to overthrow the government, Hydra abducts Third Princess Sisbell and spirits her away to the Empire. To rescue her, Rin takes it upon herself to tail Iska and company from the shadows and stage an infiltration! Little does she know that chaos brews in the land of witches...