You will play as Nicci, a powerful succubus, who, after being betrayed by her "boss", an even more powerful Demon Lord, is forced to fight a group of exorcist. After the battle she's about to die, and so her only way to survive is to transfer her soul inside one of the exorcst's body, a nun to be precise, and take control of it. To make sure to not leave any trace behind, she have to leave her own village, and burn her house. After a long travel she reach, exhausted, a remote village, where she plan to regain a portion of her lost energy due to the soul transfer and start her revenge! To regain her lost energy she need to spread corruption and lust among villagers ( but of course, she's a succubus after all!