MIDICITY, a metropolis of music. Cyan, a kitty girl dressed in gothic lolita attire, is scouted by Maple Arisugawa, the president of a music agency. Through this, she meets Chuchu (a pun on the sound rabbits make), an honor student rabbit girl; Retoree (derived from "Retriever"), a net geek dog girl; and Moa, an alien sheep (?) girl. Together, they form the band "Plasmagica" and aim for the top of the world. However, the road ahead is long and arduous, so maintaining high spirits is crucial. By competing against other unusual bands, Plasmagica gradually evolves into a top-tier group. Ultimately, they will become the driving force behind MIDICITY's music industry... Perhaps? Gonna be a music millionaire!