Since the early death of his parents, Takami Akitoshi has lived alone with his beautiful elder sister, Hitomi, while concealing his dirty desires for her. One day, a mysterious girl named Mina enters his room. She introduces herself as Death and explains that she came to take his soul because he had reached the end of his lifespan. Hearing his screams, Hitomi runs in and, after the situation is explained to her, asks Mina to spare him. Mina, moved by her earnestness, tells them that if Takami fathers a child within a week, she will let him live another 10 years. Hearing her condition, he turns his face to Hitomi… (Source: AnimeNfo)

The princess knight Lilia Evelvine is set to succeed her father as the ruler of the Leuven kingdom, but her jealous brother, Dirk, will do anything to halt her ascension to the throne. With the aid of Kiriko, his court enchantress, and Sand, the servant of the King of Demons, the dastardly prince enacts a coup to gain control of the castle and become the next king. He succeeds, but not before being reminded of his agreement with Sand: to extract the holy energy within Lilia as a tribute to the King of Demons. Dirk then proceeds to corrupt his mother and Lilia with all sorts of perversions, hoping to fulfill his task on time while turning the two into his loyal slaves. [Written by MAL Rewrite]