"Cat Eyed Boy" is a horror-fantasy anime series based on the manga by Kazuo Umezu. The narrative centers on a mysterious, supernatural being known as Cat Eyed Boy, a half-human, half-demon child with feline-like eyes and a tail. Shunned by both humans and demons, he wanders the world, often encountering malevolent spirits, demons, and humans with dark intentions. His unique existence places him in a liminal space, neither fully accepted by the human world nor the demon realm, which drives much of the series' tension and exploration of isolation.

The episodic structure of the series presents standalone stories, each delving into different horror scenarios. Cat Eyed Boy frequently becomes entangled in the lives of humans who are either tormented by supernatural forces or are themselves perpetrators of evil. His role varies from observer to reluctant protector, often intervening when the balance between the human and demonic worlds is threatened. The stories range from tales of cursed objects and vengeful spirits to grotesque transformations and psychological horror, all tied together by the enigmatic presence of Cat Eyed Boy.

Themes of fear, morality, and the duality of good and evil are prevalent throughout the series. Cat Eyed Boy's ambiguous nature reflects these themes, as his actions are not always altruistic, yet he often opposes greater evils. The humans he encounters are frequently flawed, driven by greed, jealousy, or desperation, which often leads to their downfall. The demons and spirits, on the other hand, embody the darker aspects of the supernatural world, often preying on human weaknesses.

The series maintains a dark and unsettling tone, with its horror elements rooted in both the grotesque and the psychological. Cat Eyed Boy's interactions with humans and demons alike highlight the fragility of human morality and the consequences of crossing into the supernatural realm. The episodic nature allows for a diverse exploration of horror tropes, while the overarching presence of Cat Eyed Boy provides a consistent thread that ties the series together.