Set in the Royal City dimension, the series follows Iris Raine, a teenager from Earth who discovers her superhero powers and enrolls in Tiaraland, a boarding school for heroes and villains. She befriends her three friends, Zarina Snowy, Sarah Bradshaw and Rooney Fury, and Lyna Kagura, the five girls who form the Tiara Patrol of Heroes to combat the magical forces of darkness while exploring themes of friendship, identity and empowerment, and fighting and protecting their school from the villainous Lord Valtor.