No Longer Human is a haunting and deeply personal novel that explores alienation, self-destruction, and the struggle to feel human in a world governed by social expectations. The story follows Ōba Yōzō, a man who feels incapable of understanding or connecting with others, masking his despair behind humor and false charm. As his life spirals through addiction, failed relationships, and emotional collapse, the novel exposes the quiet agony of isolation and shame. Written in a confessional style, the narrative feels intensely raw and autobiographical, reflecting Osamu Dazai’s own inner turmoil. The book examines identity, mental health, and the fear of being truly seen. Dark, honest, and unsettling, No Longer Human is a powerful psychological classic that resonates deeply with readers who have felt disconnected or misunderstood.