Blue Exorcist (2011)

S1E1 The Devil Resides in Human Souls

Rin Okumura is a teenager who has a knack for finding himself in precarious situations. He strives to live up to the high standards set by his twin brother Yukio and their guardian, Priest Shiro Fujimoto. However, everything changes when Rin uncovers the shocking truth about his origins, revealing a dark secret that alters his understanding of himself and his place in the world.