After a ruined ceremony that led to Mario, Luigi and Yoshi falling into a comatose state, Princess Peach is assigned a new bodyguard from the galaxy: A young mysterious woman who went by the title: The "Star-fighter" by the lumas and those who fear her. When the day finally arrived and the two met, "Star-fighter" dedicates her freetime to spending every hour with Peach and teaching her on swordfighting. But Bowser has other plans for Peach and her protector and friend; can the two friends survive the evil mutant's schemes or die trying?