Ao no Exorcist is a manga series written by Kazue Kato and has been serialized under Jump Square. The genre includes action, fantasy, and supernatural as well as comedy from time to time.

The Plot from Wiki :

The world of Ao no Exorcist consists of two dimensions joined as one, like a mirror. The first is the world in which the humans live, Assiah. The other is the world of demons, Gehenna. Ordinarily, travel between the two, and indeed any kind of contact between the two, is impossible. However the demons can pass over into this world by possessing anything that exists within it. Satan is the god of demons, but there’s one thing that he doesn’t have and that’s a container in the human world that is powerful enough to hold him! For that purpose, he created Okumura Rin, his son from a human woman, but will his son agree to his plans, or will he become something else…? After killing Rin’s guardian Father Fujimoto in an attempt to bring Rin back to the Demon world, it led to Rin’s journey on becoming an Exorcist in order to defeat Satan.

What Wiki does not tell is the fact that Rin also has a younger brother who is normal and makes a huge impact in Rin’s life. Also as Rin goes on trying to become an Exorcist, he needs to kept the fact that he is the devil’s son with devil powers hidden from the Church.

The manga is fun to read and I believe is worth a try. The drawing style is pretty good and sharp, though from time to time it may be hard to understand what the panel may be depicting. The downfall is the manga comes out too slow. You can begin reading here thanks to Mangafox.