JUL-992 A beautiful sister whom I absolutely shouldn't lay a hand on and I are step-siblings without blood ties... After losing the sibling restraint, the two of us indulged in forbidden intercourse during the summer days―. Tosa Ayame

At the beginning of summer when I heard the sound of cicadas, my sister Ayame and I were returning to our parents' home for the 17th anniversary of my mother's death. The reason why I went back to my parents' house like every year was because of the existence of my older sister Ayame. She was my longing older sister who took care of me in place of her mother who passed away early. Both of them are married, but I still have a special feeling for her older sister, more than family. And on the night after the memorial service was over, we were called by a solemn-looking father, who told us that we weren't really brothers and sisters...