Rin Okumura, diagnosed with Antisocial Personality Disorder (ASPD) at age of 12, well diagnosed by human standards. (I've read a few things saying that it'd be diagnosed at 18 but its for the sake of the story line of Rin being 15). When Rin's adoptive father, Shiro Fujimoto dies due to his biological father Satan, and after the unfortunate death Mephisto gains custody of both Okumura twins while the Order decided to turn Rin into a weapon for themselves. When Rin goes to his new school- True Cross Acadamey he meets his twin brothers exorcist class. They all know he's a demon and the son of Satan, they think that he heartless for that reason alone. -Inspiration of the concept from 'Middle Finger' by AngelsInTophats- ~Blue Exorcist ~A little bit of BonxRin and ShimaxRin

In a fit of rage, five year old Okumura Rin unlocked his secondary powers, and felt as if he was forced to flee because of it. While sitting in a cemetery tree, a man who claims he's Astaroth tells Rin his real father wants to meet him. Feeling helpless, Rin agreed to go with the man, and so his life in Gehenna begins.

[So in the story Rin has known all his life that he has demon powers and has known that Yukio was an exorcist.Also Rin didn't unsheathe his sword so no powers yet.And the story takes place two months after Shiro has died and it is after the exwire exam so Amimon isn't in the story yet] So in this story things are very different,If you find someone that you love of the people that you love,If your bond is strong enough then you are able to fuse with that person.(Like from steven Universe) And Rin has been dealing with a lot lately with Shiro dying,and just two months ago leaving a toxic relationship with one Reiji Shiratori that he was with for a year.And Now the exwires have to take a fusion class.So get ready for angst,Dancing,Ballroom dancing,Singing,Art,Fluff,Depression,Violin,And sibling love Guys gals and non-Binary pals I give you "Fusion Is Like Fire"