Yuri Sanada is a 45-year-old housewife living with her husband and son. Since her husband frequently travels for work, Yuri copes with her daily loneliness by using toys. Her son, Hiroyuki, no longer sees her as a mother but as a sexual object, secretly watching her every night. One day, after catching Yuri having phone sex with her husband, Hiroyuki can no longer suppress his desires and suddenly forces himself on her. The accumulated tension of everyday life reaches its peak, unfolding a dramatic story where sorrow and impulse collide.