Chisato is a married woman who is the landlord and caretaker of an apartment that she inherited from her parents. One day, Miyamura, a long-time resident, decides to return to his parents' house. As they are about to part, Miyamura suddenly pushes Chisato down and says, "I've always loved you!" Chisato reluctantly gives in to him, saying, "Just once," but she is turned on by Miyamura's intense sex, in which he seems to be pouring out his feelings for her, and becomes so aroused that she craves him again and again. However, their conversation is accidentally overheard by the neighbors...