"Wanpaku Omukashi Kumu Kumu" is a short anime series that revolves around the adventures of a young boy named Kumu Kumu, who lives in a prehistoric village. The story is set in a whimsical, Stone Age-inspired world where humans coexist with anthropomorphic animals and mythical creatures. Kumu Kumu is a curious and mischievous child, often finding himself in humorous and fantastical situations due to his boundless energy and inquisitive nature.

The narrative primarily focuses on Kumu Kumu's daily life and his interactions with the eccentric inhabitants of his village. These include his family, friends, and various quirky characters, such as a talking dinosaur, a wise old man, and a mischievous monkey. Each episode typically features a self-contained story, often involving Kumu Kumu's attempts to solve a problem, explore his surroundings, or learn a valuable lesson. The series blends lighthearted comedy with moments of adventure, as Kumu Kumu navigates challenges like outsmarting a rival tribe, discovering hidden treasures, or helping his friends in need.

Themes of friendship, curiosity, and the importance of community are woven throughout the series. Despite the primitive setting, the stories often carry universal messages about growing up, learning from mistakes, and embracing one's individuality. The episodic structure ensures that each installment is accessible, making it suitable for younger audiences while maintaining a charm that can appeal to viewers of all ages. The characters' exaggerated personalities and the vibrant, imaginative world contribute to the series' playful and engaging tone.