During the Heian Era, Yin and Yang were out of balance, the seal of Yamata no Orochi was loosened, and Kuro Seimei came back with corrosive energy, trying to overturn the order of Yin and Yang and destroy Heian Kyo.
Shirakawa Ye, a half-demon bloodline, bears the secret of the disappearance of his father Shirakawa Munechika and the fate of balancing yin and yang. He returned from the rift in the underworld, blending the power of a half-demon with the art of an onmyoji. Under the guidance of Abe Seimei, he uncovered the ghosts in the onmyo dormitory and quelled the rebellion. He grew from a much-criticized alien to a core force protecting Heian Kyo.
Undercurrents are surging in the capital, nobles are colluding, hundreds of ghosts are walking at night, and corrosive gas is raging. Shirakawa Ye and Seimei work side by side to defend the capital, guard the territory, purify resentments, and fight against the darkness with balanced power. Holding his father's will in hand, he controls the shikigami such as Yuki Onna and Inugami, and gradually uncovers the truth of ten years ago amid the chaos in Suzaku Street, the conspiracy of the Fujiwara family, and the deadly battle in the underworld.
When the two-front war between Hei Qingming and Hei Qingming begins and the seal is on the verge of collapse, Shirakawa Ye must make a choice between humans and demons, between good and evil, and between life and death. Can he keep the balance of yin and yang, prevent the big snake from breaking the seal, and protect this precarious Heianjing?
The fateful battle is about to break out. The Son of Balance will eventually face the darkness and support the two realms of Yin and Yang with his half-demon body.
