Blue exorcist

the long version

Raised by Father Fujimoto, a famous exorcist, Rin Okumura never knew his real father. One day a fateful argument with Father Fujimoto forces Rin to face a terrible truth - the blood of the demon lord Satan runs in Rin's veins! Rin swears to defeat Satan, but doing that means entering the mysterious True Cross Academy and becoming an exorcist himself. Shura Kirigakure has always been one of Rin and Yukio's most trusted friends and mentors, but her past is a mystery. When Shura suddenly goes missing, Mephisto sends Rin and Yukio to the cold and wintry north to find her. The journey is a chance for the brothers to talk over recent events, and try to sort out where things stand between them. Out in the frozen countryside, Shura reaches her destination, and a meeting with an entity who will impose an ancient curse upon her...