Nezumi is a character from the Japanese novel "No Longer Human" written by Osamu Dazai. In the story, Nezumi, which means "rat" in Japanese, serves as a guide and companion to the protagonist, Oba Yozo. He represents a sense of freedom and rebellion against societal norms. Nezumi is often depicted as a clever and resourceful figure, embodying themes of alienation and survival. His interactions with Yozo highlight the struggles of individuals who feel disconnected from society. The character has become a symbol of the complexities of human relationships and the search for identity.