Rider Prime is under attack by corrupted Servants from another dimension, and it's up to two history geeks, Zi-O and Ghost, to save their world by travelling into the Fate/Grand Order Universe to stop the invasion with the help of their new friends! (Mature Rating could be changed in future chapters) Disclaimers: Type-Moon and Shotaro Ishinomori both owned Kamen Rider and Fate/Grand Order. Please be advised. Book Cover Credits goes to DarkRose--Chan!