[Reducing Mosaic]JUL-806 The beautiful sister whom I absolutely shouldn't lay a hand on and I are step-siblings without blood ties... After losing the sibling bond, the two of us indulged in forbidden intercourse during the summer days―. Aota Yuka

At the end of the hot summer, I was returning to my parents' home for the 17th anniversary of my mother's death. Every year, no matter how busy she is, she finds a reason to come home because of her older sister, Yuka. Ever since her sister lost her mother when she was a child, she has always looked after me in place of her mother. Both of us are married now, but I've always had feelings for her sister more than siblings. Then, at the end of the memorial service that night, my father called us, and we were told that the two of us weren't really siblings...