Carrera is a talented devil who effortlessly collects rare souls, unlike her struggling and jealous peer, Mercedes. When a human man summons Carrera, he makes a surprising request for sexual intimacy as his sole desire. Although the contract dictates that Carrera must claim his soul upon his satisfaction, she finds herself so enamored with the experience that she chooses to let him live, only to discover that failing her duty carries a heavy price from her superior, Alphina.