Don't get me wrong... Please don't get the wrong idea...I...don't like my brother. I live with my younger sister, Toko, who moved to Tokyo when she entered university. While we kept our romantic feelings hidden from each other, we lived a peaceful and pleasant life together. I was living a peaceful and happy life with my sister. However, one day, my parents reveal to me that we are not related by blood. Thinking that the blood connection was no longer an obstacle, Toko confessed her feelings to me. She confessed her feelings to me with all her might. We even promised to have sex for the first time...