We open with an expository scene that goes over Rin’s self-esteem issues. Rin’s childhood was mostly filled with him being in lots of trouble because he was constantly getting into fights. He generally had good attentions but this did not stop his peers and the adults in his life from saying bad things about him. Thanks to the revelation of the previous episode, Rin now has tacit confirmation that everyone is right and he really is a rotten no good kid.
The next scene is Rin and Fujimoto running frantically for home. We get a lot of shots of the weird little Coal Tar monsters and Rin looking dazed and confused as Fujimoto drags him along. Rin wants explanations but there is not time, and Fujimoto is too busy trying to protect him from the demons that keep popping up and attacking them. They manage to get a breather, which gives Fujimoto enough time to joke about how hard it is to babysit at his age. Rin is not impressed. Fujimoto turns serious and warns Rin that there is more to come, and then we go to credits.
When we are back from credits, we see the kid who had been possessed in the previous episode. Shiratori has no memory of the fight with Rin, and his friends are a little confused about what is going on. Unfortunately for all concerned, the demon manages to regain control of the guy, and heads off after Rin and his adoptive father.
Meanwhile, Rin and Fujimoto have reached the monastery which is now on alert. Fujimoto fires off orders for protecting the monastery and takes Rin down to the cellar to show him a sword. This sword is what has been sealing Rin’s powers and allowing him to live his life as a fairly normal if extremely unlucky human boy. Rin is warned that he must never draw the sword or his human life will be over. Rin however is more worried about his brother Yukio, but Fujimoto tells him that Yukio is fully human. Apparently, Rin and Yukio are fraternal twins. It is also mentioned that Yukio was much weaker that Rin, so the demon powers went entirely to Rin.
Fujimoto has plans for a place to stash Rin, but Rin is decidedly uncooperative. His world has been turned upside down, he is scared out of his mind, and it seems to him that Fujimoto is trying to get rid of him. (Rather than trying to protect him.) Rin is also pretty upset about not having been told about what he was. They have an argument that is briefly broken up by the arrival of demons who are trying to get at Rin. After the battle, Rin and Fujimoto have another argument which ends with Rin screaming “you’re not my father.” Fujimoto slaps him, and tells him to get packed.
Rin turns to go, but does not get very far before Fujimoto says “oh no,” and falls over. Apparently the stress of Rin’s angry rejection was enough to allow Satan himself to possess Fujimoto. It turns out that Fujimoto is the most powerful exorcist anywhere, and as a result, the Devil has been trying to take him over for years. (It is mentioned that Satan is too powerful to be able to manifest completely in the human world. Anyone he tries to take over tends to burst into flame and die.)
Satan is overjoyed at having finally gotten through and is able to talk to Rin. Rin however is having a Luke Skywalker moment and definitely does not want to have anything to do with Darth Papa. Satan however does not agree and wants to have a touching family reunion with him. The monks try to come to the rescue, but they get engulfed in blue flames. Then Satan opens up something called “Gehenna Gate” which looks like a pool of bubbling tar full of eyes, random limbs and other organs. The devil grabs Rin and throws him in.
Fujimoto manages to regain control of his body long enough to have the last word in what must have been a protracted argument between him and the devil. Then he kills himself so that the devil can no longer possess his body. This temporarily banishes the devil, but Rin is still sinking into the gate.
So, Rin decides to draw the sword, which he had been specifically told not to do. He is able to close the gate using his powers, but he is unable to save Fujimoto. Rin starts to cry. The scene shifts to Yukio who moves through the wreckage to Fujimoto and then we go to the closing credits. After the closing credits, we see the funeral. Predictably, it is raining, Yukio is watching Rin, and then he walks away.
Rin is remembering the things that his father has said in the past few days, and is obviously traveling down the self-recrimination highway. Tears or rain is dripping down his face and he is obviously visibly upset. Rin remembers the phone number that Fujimoto gave him and tries to call it. He can hear the phone ring in the cemetery. Fujimoto’s friend is already there. Rin turns and sees a very strangely dressed man. Rin also sees that he is completely surrounded by very unhappy people.
The strange man introduces himself as Mephisto Pheles, the preceptor of the Japan Branch of the Knights of the True Cross. He also says that he and the other Knights present are here to kill him. Rin is given three choices, all of them involving his imminent demise. Our Boy however comes up with a fourth choice, which is joining the Knights. Mephisto thinks this is the funniest and best idea he has ever heard. (The other knights do not seem to agree with him however.)
In the next episode, Rin enters the True Cross Academy cram school. Unfortunately, the first day of school does not go very well.