The Heian Period is also called the Heian Kyo Period. This is an era of enchantment, mystery, and elegance. It was in such an era. Demons and monsters hide in the human heart. In order to balance the contradiction between the yin and yang worlds, a class of people called "onmyoji" came into being. Observing celestial phenomena, formulating calendars, surveying directions, divination and offering sacrifices, and subduing demons and monsters are their duties. Among the Onmyoji, the most famous is the bright morning star - Abe Seimei. There are countless legends about him, and his life is also full of mysteries.