Fat Princess places you on a team of fairy tale-like characters in a castle that's missing its Princess. Where is she? She's in the enemy castle, of course. The enemy is also missing their Princess, who happens to be sitting pretty in your dungeon. While it would be easy to just trade Princesses, it would not be nearly as fun as fighting tooth-and-nail to try and get your Princess back onto her throne in her castle. And to make things further complicated, on top of fighting tooth-and-nail, you also have to carry her back.