Anpanman's comrades join in on an exhibition showcasing bubbles hosted by the talented group of flutists known as the Shabondama Girls led by Shabondama-hime. Their instruments produce stunning bubbles that leave the audience in awe. However, Purun, one of the performers, struggles to create bubbles of reasonable size despite practicing hard. The issue worsens as she cannot locate her missing flute, causing her to feel inferior. Creampanda finds her flute and works to return it to her. While this happens, Baikinman takes over Shabondama-hime's stronghold and uses the flutes to create nefarious bubbles. Purun must come to terms with her worth and collaborate with Anpanman to save the day.