From the introduction:
Mushroom Kingdom is a role-playing game in which you will be given the opportunity to live the wonderful adventures of many of the characters you got to know in your favorite videogames. But what would happen to them if they were to encounter never-before-seen situations, or to work side by side with their worst enemies? Maybe what we are used to seeing on our video game screens is just a miniscule portion of a world that is actually full of secrets, mysteries, and dangers.
Can you imagine if Princess Peach’s Castle was not the safe, enchanted place you thought it was, or if the people in the Mushroom Kingdom were not all in agreement with the status quo, or if good and evil themselves were just points of view?
Mushroom Kingdom is the game that will let you inside this world like never before.