In the eight-member Yosioka family, each member becomes entangled in unexpected and shocking events. Mother Akemi develops an abnormal affection for her second son, Kenshi, while third daughter Eri harbors intense obsession toward eldest son Yoshio. As a result, boundaries between parents and children, siblings alike are shattered, giving rise to an abnormal situation where intense desires spiral out of control and bodies are consumed with lust. Amidst this chaos, eldest daughter Yukari is irresistibly drawn to third son Ryo, while father Takao succumbs to his primal instincts and takes second daughter Keiko—depicting the complete breakdown of familial bonds.