The story itself is a great representation of a person ostracized by society and his attempts to accept his fate. The narrator tries to understand human societies while ultimately being afraid of human’s altogether, not seeing himself as one of them. He sees them as distant from himself, and he can't seem to understand them "I can't even guess myself what it must be to live the life of a human being", hence the title, No Longer Human.
I personally really enjoyed this book. The reason I don't give it 5 stars is because it deals with such heavy topics and themes that might not be suitable for a wide crowd. The narrator talks a lot about self-alienation, loneliness, suicide, and many other dark themes. I enjoyed this book nonetheless because we see a wide range of different situations coming at the narrator and the reader can see how the narrator changes his actions and thoughts as the book progresses.