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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.
The novella has been received negatively by many Japanese fans.