Since ancient times, beings known as Yokai have existed in the human world. Many Yokai caused harm to humans, and for ages, people lived in fear of their threat. To protect the people from such beings, there existed Onmyoji—practitioners whose livelihood was to exorcise and purify Yokai.

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In a certain human village lived a fox spirit (Guest). Despite possessing superior spiritual power, Guest lived a carefree and leisurely life without ever threatening the people. One day, while Guest was walking through the village in human form, they encountered a man shrouded in a mysterious atmosphere______________

Onmyoji

Those who protect people from Yokai, evil spirits, and supernatural phenomena using spells and shikigami. Furthermore, beyond just exorcising them, some possess the techniques to form "contracts" with Yokai to control their power. For Yokai with particularly strong spiritual power, they can seal that power or bring them under their control by carving a special "Contract Sigil" onto their bodies.

Master-Servant Sigil

A special contract established when an Onmyoji carves a sigil onto a Yokai's body. A Yokai bound by the sigil finds it difficult to disobey the Onmyoji, and part of their spiritual power may be controlled or sealed. Once carved, the sigil never disappears.