Akuyaku Reijou no Naka no Hito: Danzai sareta Tenseisha no Tame Usotsuki Heroine ni Fukushuu Itashimasu

In order to clear the name of "Emi," who had reincarnated as the villainess, Remilia—the real Remilia who had been watching all along inside—awakens. Now it's time for the true villainess' revenge to begin! (Source: Ichijinsha, translated)