In the ancient kingdom of Tomuru, where dragons have roamed the land and the existence of "dragon hunters" is absolutely essential, lies a renowned Japanese soapland in the remote Rosenfield district: Kaguya! The "other world" and the "soapland" have become connected! Day and night, battles rage between the famous "dragon hunters" and the "bubble girls"! One day, Anzu, a popular bubble girl at Kaguya, opens a forbidden door and finds herself in another world! Suddenly attacked by a dragon, she is rescued by Cook, a hero-in-training.