The whole story is told from the brother's point of view. An incest story between me and my sister! That day, I hugged my crying sister to cheer her up, and she kissed me... Since then, I've been her substitute boyfriend. I knew this kind of relationship was no good! But even though I thought that, my lower body was still throbbing with excitement. Today, my sister crawled into my futon again. Recently, she's been coming into my room and the bathroom as if it were the most natural thing in the world, and I'm starting to lose my self-control...