Only 440 ri left until the tomboy princess loses her virginity!? In the middle of her wedding procession, Taka, a princess of the Satsuma branch clan, suddenly has to go to Edo in place of her older sister who goes missing. However, when it comes to marriage... Takahime has insufficient knowledge of society, let alone sex. Somehow, they must turn Takahime into a full-fledged woman who can drive men crazy by the time they reach their destination. To do this, they must teach Takahime various knowledge about the sexual customs of each post station. Meanwhile, the men, sensing a political conspiracy in the older sister's disappearance, feel a little uneasy about the journey and send a bodyguard to help them...