Nanako is a single mother who has raised her son Takeshi after divorcing her husband, who is a drunk and violent man who doesn't do much at work. The mother and son live happily together, needing each other, but one day something strange happens to their relationship. When his mother comes home drunk, she receives an email from a stranger on her mobile phone... Takeshi, filled with intense jealousy, begins to desire his mother as a woman...