Synopsis: Uchi no Maou ga Tenshi de tsurai

As the Dark Knight Jade takes on the responsibility of protecting Princess Vignetta, the daughter of the deceased Demon Lord, she reminisces about the final wish of the Princess's mother before being killed by the Hero. With the Princess being a young and virtuous child, Jade ponders whether she will follow in her mother's footsteps by joining forces with the evil side to fight against the Hero. It seems almost impossible for someone as innocent and kind as the Princess to resort to such actions.