Two years after divorcing her husband, Kanako lives with her son Akira. Feeling guilty for putting Akira through hardship, she finds unexpected joy upon learning he has made a new friend named Takashi, as if the happiness were her own. Kanako soon realizes Takashi is sexually frustrated and begins sensing his desire for her. Unable to resist his advances, she succumbs and is taken by him. As Takashi's actions grow increasingly aggressive, Kanako becomes trapped in his escalating obsession.