Five years after her divorce, Sawako lives alone with her son Naoto. Devoted to her job, she struggles to raise her child alone and constantly worries about his university tuition fees. When her boyfriend, Takushita, refuses to help with the expenses, she feels hopeless and turns to her boss, Executive Director Matsuki, for assistance. Everything she does is for her beloved son—but being intimate with a man she doesn't love takes a toll on her heart and body. Naoto notices the changes in his mother and confronts her. The emotional turmoil between mother and son reaches a breaking point.