The child conceived by the mortal Taki and the demoness Makie, fellow Black Guard agents whose job it is to preserve the peace between human and demonkind, is about to be born. Many see the upcoming birth as a sign of hope that the child will bring together the demon and human worlds in a new era of lasting peace. For the Shu family, however, which thrives on chaos and destruction, this is the last thing they desire. The infamous demon mob, silent for thousands of years, will stop at nothing to prevent this child from entering the world. With magic snake handlers and fire-spitting demons at their beck and call, the Shus throw everything they have at Taki and the Black Guard in order to stop an event that has been predicted for centuries.