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Final Fantasy X-2.5 ~Eien no Daishou~ (Final Fantasy X-2.5 ~永遠の代償~, Final Fantasy X-2.5 ~Eien no Daishou~?, lit. "Final Fantasy X-2.5 ~Price of Eternity~") is a novel sequel to Final Fantasy X-2 written by Kazushige Nojima. It has been released on December 26th, 2013. It ends with the words "To Be Continued".
Going on a trip together at Yuna's behest, Tidus and Yuna end up ship-wrecked on an unknown island where Tidus dies. Yuna is able to call him back from the Farplane after encountering a millennium-old unsent, but Tidus is not his old self after this event. The Farplane grows unstable afterwards and soon the dead are being beckoned back to Spira, including Sin.