"Aren't you that princess who went missing?" - Y/n is princess Peaches' sister and is married to Mario the plumber. She lives the best life she can ever imagine living and adores Mario with her entire heart. That is until one fateful day, when Mario's arch nemesis Bowser kidnaps her in hopes to bait Mario to him. While locked away in the castle, Y/n comes across a certain man in purple clothing who broke in, and convinces him to help her get back out. However, what Y/n is about to learn from this experience will turn her 'perfect' life upside down.