This fantasy anime is centred on Dariel, a soldier in the army of the Demon King. Due to his lack of magical skill he is fired. Shortly after leaving the demon realm he saves the life of Marika, a young human woman. He returns with her to her village and starts living as a human, keeping secret his demon past as humanity and demons have been at war for a long time. While his status quickly rises thanks to a series of successes things aren't going so well in the Demon realm. As the series progresses he learns more about his past and contemplates the possibility of having to face his erstwhile colleagues.
The fantasy genre of anime is fairly crowded so a series must do something special to stand out. Thanks to a degree of humour and not taking itself too seriously this manages to stand out and be a lot of fun. The action is enjoyable without fights that drag on for ages. There is some fan service but it is mild enough that it doesn't require censorship for the television version. The characters, especially Dariel and Marika are fun to watch. Overall I fine addition to the genre; it might not be a must see but it is still well worth watching if you enjoy fantasy anime.
These comments are based on watching the series in Japanese with English subtitles.