Ep 11. Demon Of The Deep

The Blue Exorcist season 1 episode 11 titled "Demon Of The Deep" follows the story of the protagonist Rin Okumura and his friends as they are requested by the Vatican to investigate a deep-sea laboratory that has been mysteriously destroyed.

Rin, a demon-human hybrid, is enrolled in True Cross Academy to learn exorcism, a skill he needs to survive in both the human and demon world. He and his twin brother, Yukio, are trained by their adoptive father, Shiro Fujimoto, in the arts of exorcism. But Rin's demon powers and his lineage make him a target of both humans and demons and he has to prove himself as a capable exorcist to earn their trust.

In "Demon Of The Deep", Rin and his classmates are summoned by Mephisto Pheles, the headmaster of True Cross Academy and a powerful demon himself, to investigate a destroyed laboratory at the bottom of the sea. The Vatican suspects that demons are behind the attack and they need Rin's expertise and strength to deal with them.

Despite his initial reluctance, Rin agrees to the mission along with his friends. They dive into the ocean in a submarine and reach the laboratory, which is located near an underwater volcano. But as soon as they reach the site, they are attacked by a horde of demon fish, who transform into giant, grotesque creatures and try to consume the divers.

Rin and his friends fight off the demons using their exorcism skills and weapons, but they realize that they are dealing with a much larger and more powerful demon than they expected. The demon has taken control of the entire laboratory and is feeding on the souls of the scientists who worked there. Its power is fueled by the underwater volcano and it poses a grave threat not only to the divers but also to the nearby town that depends on the volcanic energy.

Rin, guided by his supernatural powers, manages to locate the source of the demon's power and destroys it using his sword and exorcism abilities. His classmates assist him in the fight and together they manage to vanquish the demon and save the remaining scientists. However, the victory comes at a great cost as Rin is injured during the battle and he falls unconscious, leaving his friends to take care of him.

The episode ends with Rin waking up in a hospital, surrounded by his friends and brother. He is relieved to learn that the mission was successful and the demon is no more. But he is also reminded of the immense responsibility he bears as a demon-human hybrid and an exorcist, and the dangers that lie ahead in his journey.

Overall, "Demon Of The Deep" is a thrilling and action-packed episode that showcases the strengths and weaknesses of each character in the show. It also introduces new challenges and enemies for Rin and his companions, setting the stage for the remainder of the series.