Kumu Kumu, a spirited young boy of the prehistoric Mountain People, dwells near the smoldering slopes of Fire Mountain. His boundless curiosity and knack for mischief propel him into adventurous scrapes, earning him frequent confinement in a wooden cave—yet his warmth and loyalty forge unbreakable bonds with companions Chiru Chiru, Aaron, and Mochi Mochi, partners in his escapades.

Guided by a strict father, Paru Paru (Strongarm), the tribe’s steadfast leader, and nurtured by his mother, Maru Maru (Flora), Kumu Kumu navigates family life alongside clever older sister Furu Furu (Wildflower)—destined to marry Roman, son of elder Klopedia—and mischievous younger brother Toru Toru (Tum Tum), whose tales often land him in trouble. The tribe thrives through hunting, farming, and enduring trials like natural disasters and clashes with rival groups.

Kumu Kumu’s occasional clashes with Klopedia, the elder who guards ancestral wisdom in stone-carved tomes, subtly echo the tension between impulsive youth and timeless knowledge. Though his story unfolds through episodic adventures and playful clashes within the prehistoric community, his journey remains rooted in the vibrant chaos and wonder of childhood, uncharted by deeper arcs beyond the tribe’s 26 tales.