Hi, I'm Comet Butterfly, prince of Mewni. Me and my sister Star have been living peacefully in our dimension. On second thought, "Peacefully" isn't the word i'd use to describe my sister. You see, she's not like the other princesses. She would always get herself into trouble, and I would always bail her out. As Star's brother it is my duty to protect her from harm, but nothing could prepare me for what happened after Star was bestowed the royal magic wand on her 14th birthday...
So now we live here on earth with a boy named Marco, so Star can practice the ways of being a princess. And things weren't quite different as it was back home. I was still protecting Star and helping her out of trouble.
With Ludo and his monsters on our tail and the fact that she doesn't know how to work the magic wand, she needs all the help she can get!
This is the story of our magical adventures.