Blue Exorcist (2011)

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Shiro and Yuri manage to vanquish Satan and break free from the Knights of the True Cross. Unfortunately, Yuri's fatigue takes its toll, and she bids farewell to Rin and Yukio before passing away. Devastated by her loss, Shiro, filled with guilt and a desire to give up, finds himself ambushed by a demon. At the same time, with Satan gone from Assiah, Lucifer is despondent about the future of his cloning research for possession. In response, Mephisto and Shemihaza join forces to halt Lucifer's destructive quest to erase everything.