"Why did I end up marrying such a terrible man..." laments Keiko (Miyuki Kisaragi), a mother suffering daily under her violent husband's abuse, treated like mere livestock. Though love has long vanished, her forced sex with her husband feels increasingly like violation. Their disturbing relationship is accidentally witnessed by her son, Takuya. Sensing the awakened femininity emanating from his mother's body, his heart begins to tremble—soon giving way to an intense, uncontrollable desire. When his suppressed urges finally reach their breaking point, the forbidden boundary between mother and son collapses completely...