The animation is good, and the plot and soundtrack are fine. It's not trying to be outstanding in its first episode. One thing I would note is how casually they use characters from the Bible. Plenty of anime use demon names like Amon or Lucifer, and that can be dismissed as borrowing names. You can say "Amon" or "Lucifer," and that could refer to Amon from a game or Lucifer the cat from Cinderella. But here, they established it that they're referring to the same Biblical figures. The story of King Solomon and the demons is an elementary study in Catholic Schools. In some Christian beliefs, explicitly naming or referencing those demons is considered taboo, and many older Christians see it as spiritually dangerous.