Tsumugi is the fiance of Yuu, the eldest son of a rice cracker shop that has been in business for 120 years. To marry into a distinguished family, she must get the approval of her strict father. Beautiful, brave, and pure, Tsumugi is the ideal bride... or so she should be... But in fact, she has another face as Himeka-chan, the legendary prostitute who has been ranked number one for two consecutive years. This must never be revealed. She appeals to her sense of chastity and abstains from sex until marriage, right up to the brink... However, Himeka-chan (Tsumugi), who has been through many battles, unconsciously shows off her ``amazing technique.'' Yuzuru has doubts about Tsumugi. Then, her father asks a detective to look into Mahiro's background... What will happen? ?