Blue Exorcist

Shiemi finds a woman lying unconscious in her garden. On a train, Yukio meets Ernst Frederik Egin, who claims to be his grandfather and reveals the truth about his mother Yuri Egin, who was burnt alive by the Vatican, proclaiming her to be a witch. Ernst suggest Yukio to join him now that Shiro is dead and Mephisto has been arrested, taking Yukio to the Dragoon Laboratory, an anti-demon weapons unit. During Neuhaus's interrogation, Rin, Shura and Tsubaki learn that Neuhaus's wife, Michelle Neuhaus, is an anti-soul, a reanimated corpse possessed by a demon of vengeance. Although he preserved her body and worked at the secret Polish laboratory that Shura previously had found, Nauhaus was not behind the forbidden resurrection. The Vatican destroyed the laboratory after accusing Neuhaus of such matter, but Neuhaus and Michelle fled to the academy, which led her to become the masked man. Rin finds out the woman in Shiemi's garden to be Michelle, but Shiemi stops him from killing her. Arthur appears with the True Cross Order in the garden to slay the demon. Shura and Neuhaus arrive to stop Arthur, but to no avail. When Rin risks his life in order to protect Michelle and Shiemi by confronting Arthur, Michelle comes back to reality and dies protecting Rin from being shot by Knights of the True Cross Order. Ernst has now taken over the True Cross Order their own leader, appointing Yukio as the new Paladin, much to Arthur's disgrace. (Source: Wikipedia)