Three devil girls, Aira, Shima, and Hana, live in the human world. Putting in effort and building friendships, they lead a dazzling school life while aiming to become idols. It is a heart-pounding anime about climbing stairs... Not! They do not know the answer to "What is Idol?" and weave their way toward becoming idols through trial and error. Rocket-sensei will kindly (and sometimes strictly) guide them to become real idols in a unique way... for sure.