Five years ago, Fionna Mertens was found outside the Candy Kingdom homeless and nearly beaten to death. With nowhere else to go, and no memory of what happened, Fionna is refuged by the Candy Kingdom's ruler Prince Gumball. Fionna finds herself falling for the pink prince, who isn't as nice as he appears to be. For one thing, Prince Gumball won't let her leave the Candy Kingdom and has eyes to surveillance her when he's busy with royal duties. One day, Fionna finally decides to leave the Candy Kingdom, if only for a little while. Unfortunately, Fionna wanders into the bad part of Aaa but is saved by the rogue Marshall Lee the Vampire King. Together, they travel through the parts of Aaa Fionna only dreamed of seeing. But when Gumball notices Fionna's absence, he sends a bounty hunter to bring her back to the Candy kingdom by the night of the ball. Now Fionna is at a crossroad. Will she return to be with the man and kingdom she's always known, or will she stay with Marshall Lee and finally be free at last?