Michimune Ayatachi serves the dark deity Yagarena, whose goal is a return to Earth to shroud Japan in darkness. This ancient sorcerer possesses the power to summon demons from virtually any object or material. He specifically targets Tadahiro Amatsu due to the spiritual power residing within Tadahiro's differently colored eyes. To infiltrate the social circle surrounding Tadahiro and Yuzu Hieda, Michimune adopts the human disguise of Masashi Kusugi, a popular yet arrogant student. In this guise, he actively undermines and humiliates Yuzu while creating obstacles for the protagonists.

To combat the Miko Council, Michimune commands three Twilight Priestesses: Kukuri Shirayama, Mizuho Hamaji, and Yukie Uranami. Their dark spiritual powers and combat skills are comparable to, and in some respects exceed, those of the Miko Council members. Michimune orchestrates mystical assaults against Tadahiro and the Miko Council, leveraging both his summoned demons and the Twilight Priestesses to further Yagarena's ambitions. He possesses distinctive red skin, blonde hair reaching his neck, and red eyes.