From the introduction: Welcome to Fate. To Stay Night, and Zero, and Strange Fake. To Tsukihime and Melty Blood. But mostly, welcome to Fate Grand Order. Though, perhaps Fate Blacked Order might be more appropriate? This jump primarily revolves around the organization known as Chaldea and it’s attempts to maintain and fix human history, but you are by no means limited to it’s antics, or even to a Grail War.