Saki Uno is a struggling idol with a hopeless crush on Mohiro, her best friend's older brother and a genuine pop star. When demons kidnap Mohiro, Saki strikes a deal with Kokoro, a yakuza-looking mascot who turns out to have worked for her own mother, a magical girl forced into retirement by a bad back. Transforming, though, turns Saki into a towering, muscular man in a frilly magical-girl costume, and Mohiro, unaware of her secret, finds himself drawn to that alter ego instead, complicating a rescue that was supposed to be simple.