After witnessing the events of the Fifth Grail War and finally realizing the futility of using the tainted Fuyuki Grail, the Einzbern Clan decides to activate a second Greater Grail in the heart of Europe. So begins a most unusual war in which an entirely new cast of seven Masters and seven Servants is plunged into conflict. Will there finally be a winner?

Following the fifth war, Shiro went back to the monotony of daily life; unaware that, though the Grail was destroyed, the Cosmos still owes him a lasting wish that has a shot at fixing this multiverse of a mess up. Without the Grail to fight over this time around, how will these freed Servants and fallen Masters fare?