"Tokyo Ravens: Sword of Song" is a manga series that expands on the universe of the original "Tokyo Ravens" light novels and anime. The story is set in a world where onmyōdō, a traditional Japanese esoteric cosmology, is integrated into modern society. The narrative centers on Harutora Tsuchimikado, a member of the prestigious Tsuchimikado family, who initially lacks spiritual power despite his lineage. His childhood friend, Natsume Tsuchimikado, is the reincarnation of the legendary onmyōji Yakou Tsuchimikado and is destined to restore the family's honor.

The plot of "Sword of Song" delves deeper into the conflicts surrounding the Tsuchimikado family and the broader onmyōji community. Harutora, after awakening his latent spiritual abilities, becomes a key figure in protecting Natsume and combating various supernatural threats. The story introduces new antagonists and allies, including powerful spirits and rival onmyōji factions, who seek to exploit or destroy the Tsuchimikado legacy. Central to the narrative is the "Sword of Song," a mystical artifact tied to Yakou's legacy, which holds immense power and becomes a focal point of conflict.

The manga explores themes of duty, identity, and the burden of legacy, as Harutora grapples with his role in protecting Natsume and fulfilling his family's destiny. Natsume, burdened by her reincarnated identity, struggles with her own sense of self and the expectations placed upon her. Supporting characters, such as Touji Ato and Suzuka Dairenji, play significant roles in the unfolding events, each contributing their unique abilities and personal stakes to the story.

The narrative is driven by a mix of action, mystery, and supernatural intrigue, with battles involving intricate onmyōdō techniques and summoning rituals. The stakes escalate as the true nature of the Sword of Song and its connection to Yakou's past are revealed, leading to climactic confrontations that test the resolve and bonds of the main characters. The manga maintains a balance between character development and plot progression, ensuring that the emotional and thematic elements remain integral to the story.