Just barfing up a Fate/stay night fanfiction idea to work on refining and writing
Unlimited Blade Works True End. The action starts about twelve years later or so.
After the events of the visual novel, Saber and Archer disappear and so on, and Rin and Shirou go to London to train in magic so that Rin can teach Shirou to be a proper hero of justice. This lasts until 2011, when Rin receives word that a couple years earlier Sakura disappeared after the destruction of the Matou estate.
Rin and Shirou go back to Fuyuki to investigate. They cannot find anything more than that the estate was destroyed, Sakura is gone, and Shinji and Zouken are dead. But they stay a while as Rin mops up local business and then grows reluctant to leave again.
Around 2014-15 Rin participates in a great battle with Waver Velvet/Lord El-Melloi II, as stated in supplementary material, to destroy the Greater Grail. She sees this as an opportunity to say goodbye to the memory of Sakura. Still, she lingers in Fuyuki.
Shortly afterwards, Shirou tells Rin that he needs to go off on adventures as a hero and he will come back to her when he can. A year later he dies on an adventure.
Around late 2016 rumors of a spreading plague or curse begin to stir in Fuyuki...Rin investigates and finds it's a deadly magical humanity-destroying plague that will wipe out anyone who doesn't have rudimentary magic circuits to fight back against it.
She vows to make a contract offering her soul to the World as a Heroic Spirit in exchange for the power to grant simple magic circuits to all humans (even though this would devastate the mage world she was raised in).
But the mediator for this deal who she summons is Heroic Spirit Emiya, aka her Archer.
In her powerful presence, he quickly remembers his experiences with and feelings for her, and he refuses to simply let her make that deal. He insists that she investigate and find any other possible way.
They investigate and find out the curse/plague came from Sakura's last wishes as Zouken was taking her body.
Eventually, grieving her sister and seeing no other way, Rin decides to go through with her contract, but Archer demands to fight her before he'll let her do it.
After that...I don't know? So much more to figure out when I've reread more of the original VN and checked up on spinoffs.
turnnoffyourmind
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