The year is 2314 AD, two years have passed since the defeat of the Innovators and the exposure of the A-Laws' crimes against humanity. The A-Laws have been abolished and their infrastructure integrated into the Earth Sphere Federation Army. However, the world's exposure to GN Particles has resulted in many people awakening as True Innovators. Celestial Being has returned to the shadows to rebuild and quietly observe the infantile peace. However, an abandoned probe from an expedition to Jupiter 130 years ago approaches Earth bringing a new crisis with it, one that threatens all of mankind. While Celestial Being begins their final mission to save humanity from an unimaginable threat, Gundam Meister Setsuna F. Seiei is about to discover the true purpose of his evolution as an Innovator. Aeolia Schenberg's plan has moved into its final stage...
Shirou Emiya finds himself an unwilling participant in a deadly competition where seven Mages summon heroic spirits as servants to duel each other to the death. They compete for the chance to make a wish from the Holy Grail, which has the power to grant any wish. Shirou is unskilled as a mage and knows nothing of the Holy Grail War, but he and his servant, Saber, enter into a temporary partnership with another Mage, Rin Tohsaka. However, problems arise between Shirou and Rin's servant, Archer, who seems to seriously despise him.