No Longer Human is a semi-autobiographical novel by Osamu Dazai that follows the life of Oba Yozo, a man who feels deeply disconnected from the rest of humanity. He describes his existence as a constant performance, wearing a clownish mask to hide his inability to understand or connect with people, driven by a profound fear of others. The story traces his spiral through alcoholism, drug addiction, and failed relationships, culminating in his complete mental and social collapse. Readers are drawn to its raw, unflinching honesty about depression, alienation, and the struggle to find a sense of self. Its bleak but powerful exploration of the human condition resonates deeply, offering a stark look at what it means to feel like an outsider in one’s own life.