Blue Exorcist : Vol 23

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 truththe blood of the demon lord Satan runs in Rins veins! Rin swears to defeat Satan, but doing that means entering the mysterious True Cross Academy and becoming an exorcist himself.

The tragic story of what happened to Rin and Yukios mother, Yuri Egin, continues to unfold. Yuri and Father Fujimoto were once up-and-coming young Exorcists involved in Section 13s extensive operation to research elixirs of immortality and develop clones to house the spirits of demons. The project seemed to be moving ahead until the unexpected manifestation of a demonic spirit into one of the clone bodies. And not just any demonthe most powerful demon of all: Satan!