In early summer, when I heard the cicadas chirping, my sister and Ayame came home from my mother's 17th birthday. I returned to my parents' house almost every year because of my sister, Ayame. She was a sweet and longed-for older sister who took care of me in place of my mother who had passed away early. Both of them were married, but I had special feelings for her more than my family. And on the night after the trial ended, my father called us mysteriously and admitted that we were not biological siblings.