Loosely based on the side quest from Mario & Luigi: Bowser's Inside Story (3DS). When a disease known as Swollen-puffee-itis strikes Bowser's Domain, Bowser Jr determines to find the cure. A group who calls themselves the Best Fitness Friends provide the recipe, but things are not as they seem. Will Junior let the Koopalings help him? And is the BFF friend or foe?

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