Sayuri Ishii is an ordinary high school girl. But a mysterious new classmate Abe Nanaye was transferred to the class. Sayuri's life took a turn. Sayuri's true identity is actually the heir to the "Yodao Clan", a large consortium that is the backbone of the country's economy. However, the Yudao clan is essentially a family of Onmyoji. Abe Nanye plays an important role in this. Sayuri is unwilling to accept her new identity, but she gets caught up in various strange and terrifying incidents. At this time, she falls in love with a neighbor boy, Hanagata Chu. However, the seemingly ordinary flower-shaped Chu actually has a shocking origin. Faced with the many conflicts between her first love and the ancient Yudao clan, Sayuri struggled. Finally, Sayuri used her own power to find out all the truth. And solemnly decided to recognize his identity as the only heir of the "Yudao Clan" of the Yin and Yang family.
