Ameku Takao is a genius doctor with a knack for solving all kinds of difficult cases. When a man with blue blood is brought to Tenikai General Hospital—where Takao is the vice-director—after having his leg bitten off by a large beast, she starts investigating the intriguing case with the aid of her colleague, Takanashi.

"All who desecrate my grave shall be cursed to die." A university research team examining a grave reportedly linked to renowned onmyoji, Ashiya Doman, have started complaining about not feeling well, one after another. Takao is asked to investigate, but the case takes an unexpected turn.

Takao reveals the true identity of the "angel."