"Gunma-chan" is a comedic anime series that revolves around the personification of Gunma Prefecture, a region in Japan often stereotyped as rural and uneventful. The titular character, Gunma-chan, is depicted as a cheerful, anthropomorphic horse-like creature who embodies the spirit and quirks of the prefecture. The series humorously explores Gunma-chan's interactions with other personified Japanese prefectures, each representing their respective regions with distinct personalities and traits. These characters frequently engage in lighthearted banter, playful rivalries, and cultural exchanges, highlighting regional stereotypes and idiosyncrasies in a satirical yet affectionate manner.

The narrative structure is episodic, with each episode focusing on standalone stories that often involve Gunma-chan attempting to prove the worth or uniqueness of Gunma Prefecture, despite its reputation as a "boring" or lesser-known area. The series incorporates elements of Japanese geography, history, and culture, using humor to educate viewers about the characteristics of different prefectures. Gunma-chan's persistent optimism and determination to showcase Gunma's hidden charms serve as a recurring theme, often leading to comedic misunderstandings or exaggerated situations.

Supporting characters include other prefecture personifications, such as Tokyo, Osaka, and Hokkaido, each portrayed with exaggerated traits that reflect their real-world counterparts. Tokyo, for instance, is depicted as sophisticated and self-assured, while Osaka is lively and outspoken. These interactions provide a platform for exploring regional dynamics and cultural differences in a playful, accessible way. The series balances its comedic tone with moments of genuine appreciation for Japan's diverse regions, making it both entertaining and informative for viewers interested in Japanese culture and geography.