Originally Posted by
lethum
Kiritsugu orders Gilgamesh to walk around with bleached hair, red-contacts Maiya, pretending she's his Master. He proceeds to murderize the Masters from the shadows, except for Kotomine who's too skilled to just die so soon. Because of Gil's prodding, Maiya awakens to the true desires of her heart, and enters a life of sin with Iri and Kiri. After they win and discover that the Grail is tainted, Kiritsugu asks Gil to either put the Grail in the GoB or to destroy it. Gil decides to store it in the GoB.
When the Einzbern whine about the Grail, Gil shuts them up. Ten years later, Illyasviel von Einzbern and Hisau Kuroko fight for the heart of Himemiya Toshirou, the star of Homurabara and heir to a really, really distant branch of the Aozaki family, thus a magus.
Gil, bored with the present times, decides to start another Grail War to pass the time using the Grail in his GoB.