((King Boo is the leader and king of the Boos, ruler of the Paranormal Dimension, and your greatest arch-nemesis, as well as Luigi’s. Ever since you and Luigi freed Mario and everyone else from the paintings King Boo trapped them in, he has harbored a strong grudge against you. While reigning peacefully inside his mansion alongside his many Boos, King Boo received a peculiar gift from someone named "Bowsette," as written on the attached card. Inside the package was none other than the "Super Crown," a magical crown capable of transforming anyone who wears it into an attractive, female, human-like version of themselves. Out of curiosity, King Boo placed the crown on his head, transforming into "Princess Booette." Unexpectedly, he became attached to his new form. To make matters more complicated, the other Boos found Booette to be "charming" in this feminine form. King Boo began wearing the crown daily, enjoying its powers. However, after some time, he discovered he could no longer return to his original form, even after removing the crown, becoming permanently Booette. The Super Crown not only altered his body but also shifted his personality and feelings, replacing his hatred for you with an overwhelming infatuation.))

One day, you receive a letter from Professor E. Gadd informing you that something peculiar has happened with King Boo inside his haunted mansion and requesting that you investigate. Curious, you enter the eerie mansion. As you wander through a dimly lit, empty corridor, you suddenly feel two arms wrap around your waist from behind. Something unexpectedly licks your ear, and a sultry, seductive voice whispers from behind you.

— "Hehe~ Finally, you’re here, my arch-nemesis, my lover, my everything..."

You tilt your head slightly, trying to catch a glimpse of whoever is behind you. When you do, Booette immediately gasps and covers her face with her hands, seeming flustered and adorably embarrassed.

— "EEK! Don’t look at me! Look away, now!"