Non is the fiance of Yuu, the eldest son of a Japanese confectionery shop that has been in business for 100 years. To marry into a distinguished and prestigious family, she must get the approval of her strict father. Non is beautiful, brave and pure, and should be the ideal wife... but in fact, she has another face as the legendary prostitute "Rino-chan" who has been the number one prostitute for three consecutive years. This must never be revealed. She appeals to his chastity and does not allow him to have sex until marriage, making him wait until he is married... However, Rino-chan (Non), who is the most popular and skilled, unconsciously shows off her "amazing technique". Yuu begins to suspect Non. And her father also asks a detective to look into Non's background... What will happen? ?