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 and 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 in the world as Himeka-chan, the legendary prostitute who has been the number one prostitute for two consecutive years. This must never be revealed. She appeals to her chastity and does not allow sex until marriage, even to the brink... But Himeka-chan (Tsumugi), a veteran of many battles, is unaware She shows off her amazing technique. Yuzuru is suspicious of Tsumugi. And her father hires a detective to look into Mahiro's background... What will happen?