In the past, the \”Holy Grail War\” involving seven magicians and heroic spirits was held in the city called Fuyuki. However, taking advantage of the chaos of the Second World War, \”a certain magician\” forcibly took the Holy Grail – decades later, the Thousand Realm Tree Clan held up the Holy Grail as a symbol, rebelled against the Magic Association and declared independence. The angry Magic Association dispatched assassins, but they were countered by the summoned Servant.