"Dies irae: To the Ring Reincarnation" is a supernatural action anime based on the visual novel by Light. The narrative centers on a group of individuals entangled in a centuries-old conflict involving reincarnation, occult rituals, and the pursuit of godlike power. The story begins in 1945 Berlin, where a secret Nazi occult group, the Longinus Dreizehn Orden, conducts a ritual to summon a being of immense power. The ritual fails, resulting in the deaths of its members, but their souls are bound to reincarnate and continue their quest in the modern era. In present-day Japan, Ren Fujii, a high school student with a troubled past, becomes the focal point of the conflict. After a violent encounter with his childhood friend Shirou Yusa, Ren is drawn into a world of supernatural battles. He discovers that Shirou is one of the reincarnated members of the Longinus Dreizehn Orden, now wielding the power of a "Relic," an artifact tied to the souls of the original members. These Relics grant their wielders extraordinary abilities, but at the cost of their humanity. Ren, unwillingly drawn into the conflict, begins to manifest his own powers, which are tied to his latent connection to the ritual. The series introduces a diverse cast of characters, each representing a reincarnated member of the Longinus Dreizehn Orden. Key figures include Reinhard Heydrich, the charismatic and ruthless leader of the group, who seeks to complete the ritual and ascend to godhood; Marie, a mysterious girl with ties to the ritual who becomes a pivotal figure in Ren's journey; and Kasumi Ayase, Ren's childhood friend, who becomes embroiled in the conflict due to her connection to him. The characters' motivations and allegiances are complex, often blurring the lines between hero and villain. The plot revolves around the struggle to either complete or prevent the ritual, known as the "Götterdämmerung," which would grant ultimate power to its orchestrator. As Ren grapples with his newfound abilities and the moral implications of the conflict, he is forced to confront his own desires and the darker aspects of his nature. The series explores themes of power, sacrifice, and the cyclical nature of history, as the characters are bound by their past lives and the consequences of their actions. The narrative is driven by intense battles, philosophical debates, and intricate relationships between the characters. The stakes escalate as the ritual's completion draws nearer, culminating in a climactic confrontation that determines the fate of the world. "Dies irae: To the Ring Reincarnation" blends historical references, occult symbolism, and psychological drama to create a complex and engaging story.