The show follows Ryuudou Yukiatsu a wanderer who has the power of Ayagami. This power allows Yukiatsu to extract the power of an object or person by knowing it's name. He is eventually recruited by a strange organisation that wishes to use his power to fight demons known as Youi.
After that it is pretty much your standard superpower anime. What makes it stand out however is that the show is much more cerebral than most animes and dwells on surprisingly philosophical subjects. It also has some very beautiful animation and some very interesting characters as well.
All in all this is well above average and definitely worth a look.moreless