Kotetsu is the main protagonist of the series, a first-year student enrolled in the pilot course at the Animal Space Academy. He belongs to a world of anthropomorphic animals who have embarked on a national space program, and his driving motivation is to become an astronaut and travel to the moon. Kotetsu is characterized by an enthusiastic and curious personality; he becomes easily excited by anything related to space, extraterrestrials, or new discoveries, often throwing himself headlong into challenges without fully thinking them through. This impulsiveness is balanced by a genuine determination and a cheerful, optimistic outlook that encourages his friends to join his adventures. His primary role in the story is that of a catalyst: his dreams and his reactions to rumors—such as the possibility of an alien in the vicinity—set the plot in motion, leading his group of classmates on missions to explore forests, caves, and even space itself. Kotetsu’s key relationships include his close friends at the academy, each with their own distinct ambitions: Otama, Hikaru, Niko, Lou, and the robot DAXA-kun, as well as his grandfather, Jii-chan. While Kotetsu does not possess any unique or supernatural abilities, his boundless energy, collaborative spirit, and willingness to learn from mistakes allow him to grow throughout the series, gradually gaining a deeper understanding of real space science and teamwork. His personal development is shown through his increasing ability to channel his enthusiasm into practical problem-solving, all while maintaining the lighthearted and slightly clumsy charm that defines him.