Moths and Butterflies follows four orphaned best friends— Merabella, Annabella,  Clarabella, and Arabella— known as the "4 Bellas," who have been inseparable since adoption. When they apply to the prestigious M4High, the girls dream of a future filled with excitement, opportunity, and belonging. They quickly realize high school is far more difficult than they imagined. Between bullying, breakups, crushes, secrets, adventures, and even dangerous school trials and challenges, the girls are forced to grow up faster than expected. As pressure builds, letters from their biological parents arrive. Their once unbreakable friendship begins to crack... will their friendship survive it all?