Kato, Kazue. Blue Exorcist, Vol. 19. 2016. 186p. ISBN 9781421593333. Available in the graphic novels section of the library.
Following the discovery of Section 13 in Blue Exorcist, Vol. 18, Lewin Lightning and his apprentice Bon pursue a separate investigation into the secretive Section 13 and its connection to the devastating "Blue Night" event that happened 16 years ago. Lightning's relentless pursuit of the truth leads him and Bon into the depths of the academy, where they discover hidden chambers and long-forgotten secrets. These revelations expose a dark history and unveil the true extent of the demonic influence plaguing the world, hinting at a looming catastrophe that could plunge humanity into an abyss of darkness.
Meanwhile, Mephisto Pheles, the academy's seemingly benevolent chairman, manipulates events from behind the scenes, releasing his powerful brother Amaimon, the King of Earth, to sow discord and advance his own mysterious objectives. This act throws the academy into disarray, forcing the students to confront increasingly dangerous demonic threats while grappling with the unsettling realization that their supposed ally may be their greatest adversary.
Finally, Shuri announces she will not take the cram exam, and she tells her friends she will be hosting a Christmas party to celebrate the end of their semester and everyone is assigned a task!
The story continues in Blue Exorcist, Vol. 20.