Two years after divorcing her husband, Reiko had been living alone with her son Akira. One day, Akira brought his friend Takashi home. Reiko, who had always carried guilt over making her son feel lonely, genuinely felt happy this time. But something about Takashi was different. His true intention was focused solely on Reiko herself. This encounter would become a life-changing event that drastically alters the fate of both mother and son.