[Crossover] Aldnoah/Extra Fate

All you have to do is focus on the present and look toward the future with a smile. One year after the final battle between Slaine Troyard and Inaho Kaizuka, the Martian counts, who were publicly declared dead but actually sentenced to life in prison, suddenly disappear. Not a trace of them can be found anywhere on Earth. Three years after Earth and Mars establish diplomatic relations, Queen Asseylum Vers Allusia celebrates her twentieth birthday and marries her fiancé, Klancain. On this grand occasion, the Orthodox Church, which belongs to the Vers Empire, suddenly rebels. In the name of saving the world, it announces that it has obtained the highest secrets of Aldnoah, then launches an attack on the now-peaceful regions of Earth and the Vers Empire. The one who represents the new empire and appears at the wedding to declare war on Queen Asseylum is, astonishingly, a familiar face that has made countless people feel contempt, shock, or joy: "Earth Area 11's governor, Orthodox Church Integrity Knight, Slaine Synthesis Thirty." Yet the boy who has reappeared before everyone speaks an unfamiliar surname, and, his expression indifferent, brings down his merciless blade against Asseylum. ■A friendly note■ - This is a Slaine-centered story with the NaoIn hidden pairing, and a one-on-one ending. It uses the Sword Art Online: Alicization - War of Underworld arc as its postwar setting, and includes characters from Fate/Apocrypha. Some terminology, explanations, and plot elements are borrowed from the original works. Constructive feedback and suggestions are welcome. - Readers who haven't read the Sword Art Online: Alicization - War of Underworld arc needn't worry. You can treat this as a semi-original fantasy. This is a story born of frustration, written just to give our angel Slaine a happy ending. Please forgive my limited writing skills.