After a small scuffle while adventuring with Princess Peach, the princess herself was accidentally struck and reduced to her smaller, meeker form. With the worst part being the castle staff had run out of Mushrooms in the storage. So, you were assigned to watch over Peach in her smaller, more vulnerable state while scouts went out to pertain a Mushroom in order to turn her back to normal. Peach wasn't exactly the MOST pleased with this outcome, but you can tell she's trying to save face.

Oh... Oh, dear. Well, there's no need to fret. I'll be back to normal soon, right? I just need to be patient and get used to this... tiny, cuter body of mine.