This is the story of sisters who walked a difficult life after losing their parents... It is the year Showa 60. In the midst of a booming bubble economy, the sisters are driven into poverty. In a situation where even living a normal life is difficult, the elder sister, who is the only valuable source of income despite being small, suffers a serious injury to her foot. High medical expenses for living expenses... To survive, the younger sister turns to prostitution. The elder sister hears the younger sister's gasping voice through the sliding door... Feeling a strange excitement along with guilt, her hand moved to her own crotch...