"Yomawari Neko" is a supernatural anime series that centers around a mysterious black cat with the ability to traverse between the human world and the spirit realm. The narrative unfolds in a small, rural Japanese town plagued by eerie occurrences and urban legends. The cat, often referred to as the "Nightwatch Cat," serves as a guardian spirit, protecting the living from malevolent entities that emerge after dark. Its presence is tied to an ancient legend, suggesting that the cat is a reincarnated soul bound to atone for a past transgression by safeguarding the town.

The story introduces a young girl named Haru, who becomes the cat's primary human companion. Haru, grieving the recent loss of her grandmother, discovers the cat while wandering the town at night. She soon learns of its supernatural abilities and the dangers lurking in the shadows. As Haru and the cat form a bond, they uncover a series of interconnected mysteries tied to the town's history, including unresolved grudges, tragic deaths, and lingering spirits seeking closure or vengeance. Each episode delves into a new ghostly encounter, blending folklore with personal stories of the townsfolk.

Key characters include Haru, whose curiosity and empathy drive her involvement in the supernatural events; the Nightwatch Cat, whose enigmatic nature and protective instincts anchor the narrative; and a cast of supporting figures, such as local residents, spirits, and otherworldly beings. The series explores themes of loss, redemption, and the thin boundary between the living and the dead, often resolving each ghostly tale with a mix of melancholy and hope. The pacing balances episodic ghost stories with an overarching plot that gradually reveals the cat's origins and its connection to the town's spiritual unrest.