Eight years ago, my father remarried, and Riho and I became siblings. Although we weren't related by blood, we were family. We used to be a happy family. But… without realizing it, I started to see my sister as a woman. I was afraid to be with her. I worried that one day she would arouse my sexual desire. So I ran away from her. I used my busy university life as an excuse to escape my desires, and before I knew it, I hadn't been home for a year. I had no idea that Riho had been assaulted by my father during that time…