As the name implies, it's a "last call" for the Holy Grail of Fuyuki. After the conflict to dismantle it came to a close ten years ago, a "complete conclusion" came to the Holy Grail Wars.
Of course, nobody could have possibly predicted Keystine Meluastea, the most problem child ever.
Paying absolutely no mind to the consequences of her actions, she has
somehow managed to create a brand new homemade Grail on the same site as the old one. With that set up, she's invited seven Masters of her choosing, who are all unorthodox Magi with their own goals and schemes. On top of that, the western-only rule for Servants has been lifted, allowing some of the strongest summons in the history of Fuyuki.
Unbeknownst to her participants, she's entirely rigged the ritual in her own favour. She wrote the rules, the incompetent novice overseer is under her thumb, the Masters she invited are perfectly selected to negate each other, and she's summoned an eighth Servant who has the ability to perfectly counter everyone else here.
Because, you know, Grail Wars are always that simple, and they've never ever gone wildly off the rails before. Especially not in the face of external factors like a second, entirely different quasi-Magecraft that's been brewing in this town for the past 18 years and would really like these battles to not start again, since he lives here.
After all, that's just a loose end from an entirely different story. He's total small fry, not even a real Magus, and a quintessential background character to boot. There's no way something like that could panic, accidentally make everything infinitely worse, and create a catastrophe that makes "Holy Grail War" sound like a joke, right?
Right?
hey remember in zero with the big tentacle monster and they said "man if this keeps up we might have to cancel the grail war" imagine if they actually did haha