"Tokyo Ravens" is a manga series set in a world where onmyōdō, a traditional Japanese esoteric cosmology, is integrated into modern society. The story centers on Harutora Tsuchimikado, a boy born into the prestigious Tsuchimikado family of onmyōji but lacking any spiritual power. Despite his lineage, Harutora lives an ordinary life, distancing himself from the supernatural world. His childhood friend, Natsume Tsuchimikado, is the heir to the family and possesses immense spiritual abilities. Natsume seeks Harutora's help to restore the family's honor, which was tarnished after a catastrophic event known as the Great Spiritual Disaster.

The narrative begins with Harutora enrolling at Onmyō Academy, a school for aspiring onmyōji, at Natsume's request. There, he encounters a variety of characters, including Touji Ato, a half-demon with a mysterious past, and Suzuka Dairenji, a skilled onmyōji with a sharp personality. Harutora's life takes a dramatic turn when he discovers that he is the reincarnation of Yakou Tsuchimikado, a legendary onmyōji whose actions led to the Great Spiritual Disaster. This revelation ties him to a complex web of political intrigue, ancient rituals, and supernatural conflicts.

As the story progresses, Harutora and his allies face numerous challenges, including battles against rogue spirits, rival onmyōji factions, and the enigmatic Twin Horn Syndicate, a group seeking to exploit spiritual power for their own ends. Natsume's true identity as a girl disguised as a boy to uphold the Tsuchimikado family's traditions adds another layer of complexity to their relationship. The series explores themes of identity, duty, and the consequences of wielding power, as Harutora grapples with his newfound abilities and the legacy of his past life.

The plot intensifies with the resurgence of Yakou's former familiar, Hishamaru, and the revelation of a grand conspiracy involving the resurrection of Yakou's original plan to reshape the spiritual world. Harutora must confront his past and make difficult choices to protect his friends and prevent another disaster. The series balances action, supernatural elements, and character development, creating a rich narrative that delves into the intricacies of onmyōdō and its impact on both individuals and society.