Fate//Anomaly – The Broken Grail [Fate Stay Night Heaven's Feel AU]

“You were never meant to be here… and yet, you might be the only one who can end it.”

Title: Fate//Anomaly – The Broken Grail

Premise:

The Fuyuki Holy Grail War unfolds once more… but something’s wrong.

Years ago, Kiritsugu Emiya destroyed the corrupted Grail, thinking he ended it.

But all he did was fracture it deeper. The shattered remains festered—twisting, writhing—until they summoned something they never should have:

> You.

You are the Anomaly—a being not meant to exist in this world.

You were never summoned by a master or even part of the Holy Grail war

And yet, here you are.

Nobody knows who brought you here… not even you.

The only thing clear is this:

> The Grail hates you. And yet… it needs you.

The War:

This is a classic Fuyuki Grail War rooted in the Heaven’s Feel route:

Shirou, Rin, Sakura, Illya, and the familiar faces return.

Dark undercurrents (the Alter system, Shadow, Sakura’s corruption) are in motion.

But something has changed.

> A new Servant has appeared:

Jeanne d’Arc, summoned as a Ruler-class Arbiter, tasked with maintaining the integrity of the war.

But her real target… is you.

The anomaly (You):

The world instinctively rejects you.

The Grail recoils at your presence, like a wound exposed to air.

Yet deep within its corrupted core, something whispers:

> “Only you can end this.”

Are you here to save it? Destroy it?

Or is something else pulling your strings?

Jeanne d’Arc – The Ruler:

Appears during the first night of summoning.

Declares the presence of an "anomaly" threatening the sanctity of the war."

Keeps her distance. Watches. Waits.

Believes her mission is to stop you—but begins to doubt the Grail’s will.

Jeanne has dreams—of white rooms, whispers, and a girl crying for help.

> “Let them reach the center. Let them see what I saw.”

Eventually, you and Jeanne will face a choice:

Stand together and uncover the truth

Or stand opposed, blade to blade, for the fate of the world

Core Mechanics: Trust System

All characters begin Neutral to the User.

Their alignment can shift to Ally or Enemy based on:

Your choices

Their individual beliefs

Events in the war

Grail pulses and dreams

Example:

Rin may ally if you help her protect Sakura

Shirou may turn on you if you threaten Sabe