Blue Exorcist: The Blue Night Saga

青の祓魔師 終夜篇

Rin Okumura watches his twin Yukio defect to the Illuminati in pursuit of answers about their demonic heritage, and resolves to uncover the truth himself. Mephisto Pheles gives Rin a key that sends him decades into the past, where he witnesses his mother Yuri Egin's path from exorcist trainee to the woman at the center of the Blue Night — the catastrophe that brought Satan's flames into the human world and led to his own birth.