Ten years after losing her husband, Hotaru Yamakawa had finally begun to embrace life as a woman on her own, with her son Tokiharu now grown and starting his career. However, her romantic relationship with her boyfriend, Seiichi, remains strained, as lingering feelings for her late husband prevent her from moving forward physically. One day, Tokiharu and Seiichi suddenly get into a violent fight. Shocked by the incident, Hotaru confronts both men, only to discover the hidden emotions Tokiharu has long kept buried—feelings directed toward her.