A African prince crashes into suburban Japan with nothing but gratitude and a literal hole to fill. Every favor he returns, another stone drops into that yard, a perfectly dumb visual gag that somehow never stops working across 31 episodes. The joke isn't that he's out of place. It's that he's so earnest about repaying kindness that he turns it into a geometry problem, and the show just lets him keep digging.
Kurobe, son of the great chief of Pyrimi in Africa, clings to an airplane and ends up in Japan. Weak from cold and hunger, he drops into the yard of a man named Shishio, who cares for him until he recovers. Deeply thankful, Kurobe resolves to pay back the kindness. He digs a large pit in the yard and tosses a stone into it every time he repays a favor, planning to keep going until the pit is full. He tries to use magic to help, but as a wizard he is still inexperienced, and his spells often go wrong. The result is a 1973 comedy built around how long it might take him to fill that hole.