[Reducing Mosaic]JUR-237 "No experience in the sex industry" my fiancée said, but her technique is so good that I'm constantly suspicious. Akari Tsugumi.

Tsugumi, the fiancée of Yuu, the eldest son of a senbei shop that has been in business for 120 years. To marry into a prestigious family, she must be approved by her strict father. Tsugumi is beautiful, cheerful, and pure—she seems like the ideal bride... or so it was supposed to be. In reality, she has another face: the legendary hostess 'Himeka-chan,' who has been number one for two consecutive years. This fact must never be discovered. To emphasize her chastity, she doesn't have sex until marriage, stopping just short of the act... However, the battle-hardened Himeka-chan (Tsugumi) unconsciously displays her 'amazing technique.' Yuzuru begins to suspect Tsugumi. Meanwhile, her father hires a detective to investigate Mahiro's background... What will happen??