"Cat Eyed Boy" is a horror manga series created by Kazuo Umezu, serialized in the late 1960s and early 1970s. The protagonist, Cat Eyed Boy, is a mysterious, supernatural being with feline features, including cat-like eyes, claws, and a tail. He is neither fully human nor fully demon, existing in a liminal space between the human world and the demon realm. Rejected by both humans and demons, he wanders the earth, often encountering grotesque and terrifying situations.

The narrative is episodic, with each chapter or arc presenting a self-contained story. Cat Eyed Boy frequently becomes entangled in the lives of humans, often those who are suffering or facing supernatural threats. His presence typically exacerbates or resolves these conflicts, though his motives remain ambiguous. He is neither a traditional hero nor a villain, often acting out of self-preservation or curiosity rather than altruism.

The stories explore themes of fear, morality, and the darker aspects of human nature. Many arcs involve humans who are manipulated or punished by demons, often as a result of their own greed, cruelty, or ignorance. Cat Eyed Boy occasionally aids these individuals, but his interventions are unpredictable and sometimes lead to further tragedy. The series is notable for its unsettling atmosphere, grotesque imagery, and moral ambiguity.

Key recurring elements include the presence of demons, who often serve as antagonists, and the exploration of human vulnerability in the face of supernatural forces. The artwork complements the tone, with exaggerated, nightmarish designs for the demons and a stark, unsettling style for the human characters. The episodic nature of the series allows for a wide variety of horror scenarios, ranging from psychological terror to visceral, body horror.

Cat Eyed Boy himself is a complex figure, embodying both menace and pathos. His outsider status and ambiguous morality make him a compelling focal point for the series. While he occasionally displays empathy or acts to protect humans, his actions are often driven by self-interest or a desire to witness the chaos that unfolds around him. This duality adds depth to his character and reinforces the series' exploration of moral ambiguity.

Overall, "Cat Eyed Boy" is a seminal work in the horror manga genre, known for its chilling narratives, distinctive protagonist, and exploration of the darker aspects of human and supernatural existence.