Hidden (Rin x OC)

It was a story in which where Satan gave some power to a baby girl, Emiko Ikari.

abandoned by her family, growing up with uncontrollable powers, until she meets a family kind enough to take her in. Yet they can't control her, so every day, send her off to the paladin to help her gain control.

Yet on one night her parents are murdered, she stops her lessons with the exorcist and of actives on hew own, in her lonely house. She also overstudies and works to get into one of the most prestigious schools, true cross.

Warning: ALOT of swearing/bad language.
Maybe some cringe but I'll try my best.
Mentions of self harm, suicide and disordered eating.

Mafisto knows of her powers and allows her to attend the exorcist school, too, rooming her in a building with the 2 sons of Satan, Rin, and Yukio.

She knew them when they were kids, yet as the school year goes on, she finds herself with Rin more often. Yet, at first, she doesn't like him.

Will they bond or hate each other the whole year, even after finding out about her powers.