Anpanman’s friends attend a bubble show performed by Princess Shabondama and her Shabondama Girls, who create exquisite bubbles by playing their flutes. Among the girls is Purun, who struggles to make large bubbles despite her practice and feels inadequate. When her flute is lost, she searches for it while Creampanda finds the instrument and tries to return it. Meanwhile, Baikinman seizes Princess Shabondama’s castle, steals the flutes, and uses their power to produce evil bubbles. Purun must recognize her own worth and, with Anpanman’s help, save the day.