Ichika is forced to marry for political reasons to ensure the survival of her clan. The other party's family has an old custom, which requires her to spend a week alone with the head of the family before the wedding. "It's just a custom in name only; my role is to be embraced by my perverted father-in-law..." she thought, and prepared herself for it. However, her father-in-law's request was beyond her imagination. Ropes, candles, and repeated humiliation... Ichika 'Kokoro and body are developed through repeated training, and Ichika...