Depleted of luck following a string of misfortunes, You Keika takes on part-time work in an attempt to escape poverty. After a peculiar meeting with a white-haired man in a junkyard, You awakens to find that he died in a sudden accident and has turned into a spirit. The man he met, Tanmoku Ki, is identified as the 13th Youmeshi of the Tanmoki clan, China's highest-ranking family of exorcists. Spotting the wandering spirit, he proposes a pact to You: he will provide protection from humans, and in exchange, You must serve as his spirit shadow, ensuring his safety and vigilance at all times. Thereafter, the pair confronts numerous challenges within the spiritual realm, working to shield those around them from malevolent spirits. Over time, their pact evolves into something deeper; a connection neither anticipated. Beneath their dynamic of master and servant, a persistent admiration starts to surface.