A Shinagawa Monkey by Haruki Murakami

A surreal, melancholic tale in which a narrator's chance encounter with a strange, almost human monkey at a Tokyo train station unsettles him and triggers reflections on marriage, memory, and identity; as the monkey's enigmatic presence intrudes on everyday life, the boundary between the ordinary and the uncanny dissolves, forcing the narrator to confront loneliness, desire, and the fragility of self.