Yuki Mishima is hospitalized with her husband to cure her long-standing illness. However, contrary to her current appearance, she used to bully classmates in her school days, leading them to refuse to go to school. She has forgotten what happened back then, but the victim, or rather the victim's sister, is the nurse in charge and has been quietly waiting for this opportunity. Ten years have passed and their hatred has grown to the maximum, and the ultimate game of revenge begins...