Petit Castor inhabits a forest hut alongside his father, his mother having perished during his infancy—a foundational element of his past. His days revolve around woodland escapades with companions Lili and Nanours, where they regularly confront obstacles orchestrated by rivals Garou and his allies. Facing adversity, he unfailingly turns to his father for aid, reflecting his dependence on paternal support. A persistent storyline drives his search for his mother, who vanished before the series commenced, though her ultimate whereabouts stay undefined. Every adventure unfolds within the forest realm, devoid of sophisticated technology beyond rudimentary features like a well. This setting sharply diverges from the opening credits' imagery of contemporary sports complexes and amusement rides, unconnected to the plot. Social exchanges involve consistent teamwork with friends alongside repeated skirmishes with opposing figures.