After getting married, Satoko continued to work as a nurse. Even though they were both busy, her husband still loved her and wanted to spend time with her. However, she was noticed by Shimoyama, an inpatient who had a hobby of making other women his own. During a night shift, she was taken by Shimoyama. And after finishing, he put on her a chastity belt, which only he could open. From then on, she officially belonged to him, only he had the right to do that to her, even if her husband wanted to have children with her...