The story background describes the events surrounding the boy Tsuchimikado Harutora, who was born in the Tsuchimikado family. I am willing to be your shikigami, always by your side, and protect you forever. A long time ago, the young boy made a promise to the girl, before he knew the meaning of "future" - In the past, during the Great War, the Imperial Japanese Army re-established the Onmyoji Ryo to apply sorcery to the military, and appointed Tsuchimikado Yoko, a descendant of the legendary Onmyoji Abe Haruaki, the head of the Tsuchimikado family, as the leader. He successfully reformed the Japanese sorcery world and became the father of modern sorcery. At the end of the war, the defeated Imperial Army asked Ye Guang to perform a large-scale magic ritual to save the situation, but the ritual failed. Not only did Ye Guang, the performer, die, but it also strongly disturbed the spiritual energy of the capital Tokyo, causing Tokyo's night parade of hundreds of demons and monsters. It was not until after the war that the Onmyo-ryo was renamed the Onmyo-do, responsible for dealing with spiritual disasters in various parts of Japan, mainly in Tokyo. Tsuchimikado Harutora is a young man born in the Tsuchimikado family. Although he is the descendant of a famous Onmyoji family, he has no Onmyoji talent and lives an ordinary life. One summer, Harutora met his childhood playmate, Natsume, the girl who was the next head of the Tsuchimikado family. The two who had made a promise in the past but now went their separate ways, meet at this moment, and Tsuchimikado's history begins to change, gradually leading him to a "future" full of twists and turns, crows dancing in the darkness, a fantasy of yin and yang that transcends time and space!