It seems you are looking for information about the book "Indigno de ser humano" (the Spanish title for Osamu Dazai’s classic No Longer Human ).
Here is a write-up about the book: Author: Osamu Dazai Original Title: Ningen Shikkaku (人間失格) Published: 1948 (posthumously) Genre: Psychological fiction, autobiographical novel, tragedy Synopsis Indigno de ser humano is the harrowing, semi-autobiographical confession of a young man named Yōzō Oba, who feels fundamentally disconnected from the rest of humanity. From childhood, Oba is haunted by a deep sense of alienation and terror in the face of human emotions, behaviors, and social rituals. Unable to express his true self, he learns to perform the role of a clown—a mask of cheerful absurdity designed to amuse others and hide his profound inner emptiness. indigno de ser humano libro