She claimed to have "never had any experience with prostitution," yet her fiancé's incredible skills drove me to the brink of madness with suspicion. (Satsuki Fumino JUR-169)

Fumino, the eldest son of a 150-year-old brewery and China's girlfriend, must gain her strict father's approval to marry into this prestigious family… Fumino possesses a pure, angelic smile, making her the ideal daughter-in-law… However… she also harbors a secret side, being the number one sex worker for three consecutive years, known as "Karako." This true nature must not be revealed. She uses the concept of chastity to seduce China, ensuring they don't have sex before marriage, causing China anxiety… But the most powerful Karako (Fumino) unconsciously unleashes her "superb skills." China begins to suspect Fumino… China's father also hires a detective to investigate Fumino's associates… What will the ending be?