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Nanoka stumbles through a portal into the Taisho era, where she is rescued from a terrifying yokai by Mao, an initially unwilling exorcist. Upon returning to her own time, she discovers she has gained extraordinary powers. Motivated by a desire to understand these new abilities, she travels back to the past. There, she becomes involved in Mao's investigation of a series of gruesome murders. As she delves deeper into the mystery of her own nature, Nanoka learns that both Mao and his sword are cursed by a demonic cat named Byoki. The curse ensures that anyone other than Mao who wields the sword will face a dire consequence. However, when Mao's life is in peril, Nanoka grabs his blade and swings it without hesitation.