In a futuristic world, sex cyborgs designed to satisfy male desires are developed. Among them is Mai-chan, a kind and gentle cyborg in human form. Programmed to obey her creator, Dr. Aki Kamiya, she lives a life of submission, treated as a mere sexual toy by men. However, after prolonged use, human-like emotions begin to awaken within her. Despite being a machine, hidden feelings and emotions gradually surface, making her relationships with men increasingly complex. A story where the boundaries between human and cyborg blur, told through a futuristic sex doll.