As luck would have it, you are back in the Flower Fields near Tenuto Village. Frederic is determined that this is all make believe and a dream and that this final battle will prove it.
If you die during this battle, you will trigger a cutscene with a rather disappointing ending. If you win, it is a little bit more satisfying. And voilà! You have won and can now try your luck with Encore mode.
Congratulations! You have successfully completed Eternal Sonata. If you would like, you can try your luck with Encore.