Ajin: Demi-Human is a dark seinen manga series that blends supernatural suspense, psychological tension, and high stakes survival in a world where immortality becomes a curse instead of a gift. The story follows Kei Nagai, an ordinary student whose life changes forever after he discovers he is an Ajin, a rare immortal being feared by society and relentlessly hunted by powerful institutions. Forced to run from capture while trying to understand his new identity, Kei is drawn into a dangerous conflict involving secret experiments, political manipulation, and violent clashes between humans and Ajin. Known for its intense atmosphere, smart storytelling, and morally complex characters, Ajin stands out as a gripping thriller manga that explores fear, isolation, power, and the value of human life. With its mix of action, mystery, horror, and psychological drama, Ajin manga is a must-read for fans of dark supernatural stories, survival manga, and mature suspense series. Read Ajin: Demi-Human manga online and discover one of the most compelling modern seinen manga built around immortality, conflict, and hidden truths.