Blue Exorcist

There are two worlds in Blue Exorcist: Assiah, the human world, and Gehenna, the realm of demons, and the two are never supposed to touch. Demons still slip into ours by possessing whatever they can find, and a hidden order of exorcists exists to stop them. Rin Okumura is a hot-tempered teenager who has always been strong for his age, until the night he learns the truth: he is the son of Satan, ruler of Gehenna. When his guardian, the exorcist Father Fujimoto, dies protecting him, Rin draws a demon-slaying sword, Kurikara, and awakens a blue flame that is not human, and he vows to defeat Satan himself. He enrolls at True Cross Academy, a school that secretly trains exorcists, where his younger twin brother Yukio is already a prodigy and an instructor. As Rin trains alongside classmates like the gentle Shiemi and the sharp-tongued Ryuji Suguro, he has to keep his true parentage hidden while fighting the very demons he descends from. It's a fast, energetic, and surprisingly heartfelt supernatural action story about family, identity, and choosing who you want to be.