During the 100 days our mother was away, we've become bodies that can't function without our stepfather's incredible penis... Sakamichi Miru, Yumi Shion, SSNI-901

The cheerful and lively older sister, Miru, and the mature and composed younger sister, Shion, are renowned beauties in the neighborhood. After their mother remarries and takes a new stepfather, her stepfather's attitude towards the sisters changes after the mother returns to her hometown to give birth...