Nuko

Nuko is a peculiar creature that Chito and Yuuri stumble upon during their wandering journey across a desolate world. Nicknamed after a cat due to its feline-like appearance, Nuko's true nature is far more extraordinary—it absorbs unstable materials such as bullets and fuel, playing a vital role in maintaining environmental equilibrium on Earth. Capable of communicating with humans via radio signals and even operating machinery, Nuko becomes an indispensable companion in the later chapters of the story, ultimately serving as the key to unlocking the mysteries behind the world's forgotten history.