"Nihon Omoshiro Mukashi Banashi" is a collection of short, self-contained episodes that adapt traditional Japanese folktales and legends into animated form. Each episode presents a standalone story, often rooted in cultural or historical contexts, featuring a mix of humor, moral lessons, and supernatural elements. The series draws from a wide range of sources, including well-known tales like "Momotaro" and lesser-known regional stories, offering a diverse glimpse into Japan's rich folklore.

The narrative structure is episodic, with no overarching plot connecting the stories. Instead, each episode introduces new characters and settings, ranging from ordinary villagers to mythical creatures such as yokai, oni, and kami. Common themes include the consequences of greed, the importance of kindness, and the interplay between humans and the supernatural. Many stories feature clever protagonists who outwit adversaries or resolve conflicts through ingenuity and resourcefulness, while others highlight the consequences of arrogance or dishonesty.

The tone varies between episodes, blending lighthearted humor with moments of tension or moral reflection. Some tales are whimsical and comedic, often employing exaggerated character designs and slapstick humor, while others adopt a more serious or eerie atmosphere, particularly those involving supernatural entities or tragic outcomes. The series maintains a balance between entertainment and cultural education, preserving the essence of the original folktales while making them accessible to a modern audience.

Characters are typically archetypal, reflecting the moral and cultural values of the stories they inhabit. Protagonists often embody virtues like honesty, bravery, or humility, while antagonists may represent vices such as greed, pride, or cruelty. The simplicity of character development aligns with the traditional nature of the tales, emphasizing universal lessons over complex personal growth.

Overall, "Nihon Omoshiro Mukashi Banashi" serves as an animated anthology of Japanese folklore, offering a concise and engaging way to explore the country's storytelling traditions. Its episodic format and varied tone make it suitable for viewers of all ages, providing both entertainment and cultural insight.