No hobbies, never had a boyfriend, just a single corporate slave... And still... A virgin. Words that perfectly describe our protagonist, Ikeda Ami. One day, while drinking alone at a park, she is called out by Kanata, a boy who she used to play with long ago. Concerned for her safety, Kanata forces her home, but that's when things take a turn. They decide to play a game where she has to do whatever he says every time she loses. And well, she loses every time... and every time she loses, the penalty was always... sexual... From touching the insides of her mouth to caressing her body to touching her pussy to ultimately having sex... Something awoke inside her that night, leading her to become his... slave...