Mamejiro is a 6-years-old boy who lives in the countryside. He is very strong and courageous, due to helping his parents in agricultural work. After his father, a former professional wrestler, ate his ice cream, Mamejiro decides to become a delinquent. For his first felony, with the help of his best friend Joji, he decides to steal the money of a man who happens to be the burglar who attacked the neighboring agricultural cooperative. For helping the police intercept the man, Mamejiro is rewarded with a mountain of ice cream.

(Source: Dragon Ball Wiki)