The story is about Rin Okumaru who doesn't know what to do in life, he is always fighting other people
he has a non identical twin brother called yukio who is a lot different to Rin as he is smart, mature and knows what he wants to do in life as he wishes to be a doctor. They live with a man called Shiro Fujimoto who is a priest.
As Rin is out for a job interview he comes across a guy who he had a fight before but he is possesed by a demon and tells Rin that he is the son of satan , he needs to come with satan...
Rin Okumura is then saved by father fujimoto.... who tells the truth that Rin Okumura and Yukio Okumura are the bastard childrens of satan, with a human mother. Father Shiro Fujimoto is killed ... Rin swears to become a exorcist to kill satan ...And protect everyone and no one will die because of him.
Characters: The characters were a bunch of teenagers with enough personality quirks to set them apart from each other. Well, we have Rin,only cause trouble who's not good in anything, except cooking. Then his perfect smart kind and brother Yukio. Their friend, shy naive Shiemi.
This seems to be a really good anime. to you, so I guess you won't be bored.
If you like fantasy shounen, demons, and stuff...you should watch it ,I really recommend it .