The modern, kira☆kira girls Tsumugi, Sayaka, and Chika disappear after saying they're going on a trip, and their mothers Nana, Chihiro, and Reiko rely on a little information to find them at a hot spring resort in the countryside called "Secret Hot Springs." Inka Nana and her friends arrive at the inn "Mitsuryuya". They had asked an E-BODY investigator to investigate their daughter, but they hadn't heard from him since he left for the inn. They are greeted by the beautiful landlady Chisato at the inn, and they immediately begin to search for their daughter, but the inn hides a lewd conspiracy beyond their imagination...