Blue Exorcist (2011)

S3E8 Determination

Michael Gedoin, captivated by his admiration for Lucifer, intensifies his efforts to support his Elixir research. He orchestrates a scheme to split Rin from his team, forcing each member to confront their own challenges alone. While Rin battles a massive, grotesque Zombie in the underground lab's storage, he hesitates to draw his sword upon discovering that the creature is actually a human corpse under demonic possession. Meanwhile, Yukio, Suguro, Shiemi, and Konekomaru are each left to confront their own demons within the laboratory, facing their trials in isolation.