Kyoichi injured his arm and found it difficult to live his daily life. At that time, his neighbor Tsubasa decided to look after him... Tsubasa, who had always had a stronger sexual desire than most people, happened to discover Kyoichi's weakness and took the opportunity to play with him, bringing out his hidden masochistic nature. Kyoichi was used as a flesh vibrator and had his ejaculation controlled in various ways, until he became addicted to the abnormal pleasure and became her slave. And then, one week later...