To repay her deceased sister's debts, Mai ends up at a brothel. There she meets Madoka, a senior courtesan who is both kind and strict, forcing Mai into various sexual experiences. Each time she opens her body, she becomes wet again—gradually transforming into a true woman. Through these encounters of love and sex, Mai's heart begins to change. Eventually, the day comes when she must entertain clients. Together with Madoka, she is made to perform intense acts, fulfilling the guests' desires. Repeatedly experiencing passion, Mai finally sets off on a new path.