Blue Exorcist - Season 1 - Eps 2: Gehenna Gate
Fujimoto and his companions try their best to protect Rin from the demons who are after him, but he ends up posessed by Satan, the most powerful of the demons and Rin's father. Seeing his guardian taking his own life to protect him fron Satan, Rin decides to fight back by unlocking his demonic powers, even knowing that by doing it he would not be a human anymore.
About Blue Exorcist

Title: Blue Exorcist
First Air Date: 2011-04-17
Last Air Date: 2025-03-09
Status: Returning Series
Rating: 7.898/10 (from 460 votes)
Language: JA
Seasons: 6
Total Episodes: 73
Network: MBS TBS CBC Gunma TV Tokyo MX BS11 Tochigi TV i-Television SBS
Genres: Animation, Sci-Fi & Fantasy, Mystery, Action & Adventure
Production Companies: A-1 Pictures, Aniplex, Shueisha, movic, dentsu, MBS
Synopsis
Humans live in the world of Assiah, demons in Gehenna. The two dimensions are not meant to interfere with each other, but demons still possess creatures in Assiah in spite of this. The humans who can fight these demons are known as exorcists. Rin Okumura is a boy who bears the curse of being Satan's illegitimate son. His foster father sacrificed himself to save him from demons. To avenge his foster father's death as well as to prove himself, Rin decides to follow the path of an exorcist and defeat his own father, Satan. To hone his raw skills, Rin enters True Cross Academy to train with other exorcist candidates.
Cast

Hiroshi Kamiya
Mephisto Pheles (voice)