I have a secret I can't tell anyone. Ever since a traumatic incident, my sister's memory resets every time she falls asleep—and I've been having sex with her over and over. At first, I started it as a form of shock therapy, trying to help her recover. But as it continued, I began to feel a growing sense of fulfillment inside. She became the perfect, convenient existence for me. Yura feels exactly like an ideal little sister should. Still, I can't help but feel guilt and shame about our relationship. I'm sorry... for being such a terrible brother. I don't even fully understand myself yet.