Anpanman's friends go see a bubble show performed by Shabondama-hime and her Shabondama Girls, who make exquisite bubbles by playing their flutes. One of the girls, Purun, can't make big bubbles no matter how much she rehearses. She feels inadequate as she goes to retrieve her lost flute, which Creampanda finds and goes to return. Meanwhile Baikinman takes over Shabondama-hime's castle and steals the flutes...