Today is Girl's Day. At Gotchi King's castle, a Girl's Day party is held in which only girls invited by Princess Tamako can participate. But the boys who really want to join the party sneak into the castle! When Mametchi ate sweets with his friends, his teeth started hurting! Maybe it's a cavity? Scared of going to the dentist, Mametchi does everything in his power to get rid of the cavities himself.