Sir Princess Petra has already attained her knighthood in the Kingdom of Pen Pieyu and her non-princess-like talent certificate from Talent School, neither of which pleases her father and mother, the king and queen. The king writes up more silly rules in the royal rule book to deter Sir Princess Petra from her knightly ways and useless talent, and turn her into a real princess once and for all. Will the king finally succeed with this newly written, ridiculous mission for Petra?