A dutiful police robot on Nanshi Island, Mappo is responsible for supervising all sorts of ne’er-do-wells. That includes Pokkle, a young lad who has committed the crime of sleeping through his own coming-of-age ceremony! Now that the mayor has demanded Pokkle raise enough money to fund another one, this dutiful enforcer is pulling out all the stops, including a tight curfew and a heavy ball and chain. Crime never pays!