Kill a demon. That was the only instruction given to Class 1-A before the students were sent on a mission to a school none of them have ever heard of before. True Cross Academy, a place for the incredibly gifted. And for the quirkless. Unlike anything any of them have ever seen, the class are instantly on their guard, and have little choice but to team up with none other than the school's faculty of exorcists. A small group harbouring a secret way bigger than themselves. Because, unbeknown to Class 1-A, their target is much closer than they've yet to realise. And Rin intends to keep it that way, for the sake of his own life. The son of Satan versus a group of superhuman teenagers. This should be fun.

31,198 words: A routine exorcism trip goes horribly wrong when the cram students get into a car accident and become stranded in the middle of nowhere.

( this my first fanfiction crossover so might be a little bad) After defeating The Impure King, Rin finally accepts who he is, the son of satan. while taking a walk to clear his mind of everything happening flash of light happens unknowingly what it is to rin, he finds himself back of an alleyway. rin question himself, where is he?, and where is everyone? all the questions flooded Rin's head but, enough stalling he decided to leave the alleyway he was at, on the way he meets the 2# hero Endeavor they battle each other for Rin to prove to him he wasn't from this world, not only Rin manage to get a few hits but, was impressed by his power, he meets Shoto Todoroki Endeavor's son, hopefully to be friends with him and gain his trust will he mange to gain his trust and title as friend?Rin attends U.A with Todoroki, Rin makes a few friends even the hot-headed Bakugou. Will Rin ever return home or stay in this world of Heros and Villians? Read to find out ( the story will still follow up the same BNHA plot but I will change a few things and add a few plots of my own) ( I do not own BNHA nor Blue Exorcist neither any of these characters they all belong to their rightful owners )

RIn and Shiemi have unfinished business with the dimensional battle they had with Rin's evil self. Having affected Eren and Mikasa Jeager's timeline to be led to a dark conflict. They put away their safety to go the world where that has ridden away the Titans but face the dark group of the kingdom and military. Eren's past comes back to surface as a new villain appears to harm his family. He puts aside his hesitations of harming humans to find Mikasa. With his daughter, Alice, help. And with the help from the son of Satan and the last few members of the Survey Corps. They set off to fight...A new Titan-Shifter...A new Colossal Titan-Shifter...and humans. ...Civil War has begun... ----I don't own Attack on Titan or Blue Exorcist---