Nanako falls in love with Mai, a popular therapist at an all-female soapland. When Nanako learns that Mai has decided to quit the job, she resolves to enter the soap industry herself and knocks on the door of the very shop where Mai once worked. There, she encounters Mako, the strict and feared manager known for her harsh training methods—who also shares a deep bond with Mai. Amidst the foamy paradise, passions flare and tensions rise as the soap princesses become entangled in a fierce, seductive lesbian battle.