Pink Exorcist

Rin wasn't the only half-demon child of Satan. Sakura Haruno has claimed the title of Satan's only daughter. She went out on a search for her rumored little brother and found him. Now that she has found her only remaining, and trustworthy, family she isn't going to let them go, she's going to fight. She's not going to let Satan win and she'll make damn sure that Rin doesn't lose.