[Reducing Mosaic]JUL-587 The beautiful sister whom I absolutely shouldn't lay a hand on and I are step-siblings with no blood relation... After losing the sibling bond, the two of us indulged in forbidden summer days of intercourse and adultery. Fujimori Riko.

On a summer day when the cicadas were loud, I returned to my childhood home for my mother's 17th memorial service. I had made it a point to return every year because of my sister Riho's presence. My admired sister had been taking care of me ever since our mother passed away at an early age. Although we are both adults and married now, I still harbor special feelings for my sister that go beyond sibling love. That night, after the memorial service, my father called me to talk and revealed to me that Riho is not actually my real sister…