Fontaine's biggest Star

What if furina isn't as strong as she was originally? What if after the trial all that thread that kept her sanity all snapped?

For five centuries, she had been the master of the bated breath and the painted smile. She had acted, and acted, and acted, until the greasepaint became her skin and the stageboards her only solid ground. Every single night-and every grueling, sun-drenched day-she had, without a shadow of a doubt, played her part with a precision that bordered on the divine. For 182,376 days, the clockwork of her heart had ticked only for the audience.
But even the finest clockwork, when wound too tight for too long, must eventually succumb to the metal's fatigue.
Now that the prophecy has dissolved into the salt spray of the sea, and Fontaine stands bathed in a safety she bought with her own soul... would a long-awaited retirement be so selfish?

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Furina had always been Yuu's favorite. Her story in the 4.X was, without a doubt, the one that stayed with them the longest. In the quiet hours of the night, Yuu used to daydream of comforting her-especially during that final, heartbreaking masquerade. Even with school the next morning, they had wept until their eyes were red, mourning a sorrow that felt all too real.

But now, the impossible has happened. Yuu has been pulled from their world and cast into the heart of Fontaine. With the veil between realities finally parted, isn't it only right to fulfill that once-impossible dream?