Fate/Hydra's Heads

Taking place in Berlin, Germany during the end of the Cold War, three factions begin a secret battle of mages that has been brewing for the past 40 years. With the public's attention on other matters of the Cold War, select mages were invited into the military forces of their countries and trained as soldiers.

In 1949, the three factions - Russia's White Faction, the United States' Green Faction, and the Gold Faction under England and France - summoned a total of 21 Servants. Each sought to use these as an intimidation factor to force surrender, over the years making displays of the prowess of the various Servants' abilities. This continued for nearly 40 years, until Russia blockaded East Berlin. The factions of Green and Gold entered West Berlin, officially breaking the agreement between the factions - no Servants would be allowed to enter Berlin. The Masters and Servants of the White Faction were summoned in response, triggering an immense battle between the Servants that would sweep through Berlin.