Before you do this cheat you should save because once you do it then you will not be able to continue the game.
After about a good five hours of playing you should be somewhere around the place I have just encountered, you will be cast out to the ocean and land on a deserted island which is pretty much empty, your team will soon ask you "what do you want to do?" simply reply "I like it here" and then continue by saying "I want to live here."
By doing this you will have somewhat ended the game, it even says "THE END", but its not real.
And you will also lose the characters pictures that sit by the conversation box, it will be replaced by bad doodles of the characters instead.
The game does go on with the basics of living on an island, you will have to find food and other fun stuff. Enjoy!