"I don't need words for my sister's physical relationship ... One day my parents remarried ... and my partner's stepchild, Ichika, came home as my sister-in-law. Suddenly, life with my sister who is cute and has no blood connection. I will be conscious of naughty things. One day, while my parents were out, I was alone with my sister ... I became more conscious than usual, and when I saw it, my sister seemed to be conscious ... And the two remained silent without conversation. The atmosphere alone leads to the act. From that point on, the physical relationship between me and my sister, "If you have eyes and eyes, you'll silently sprinkle like a monkey" has begun ...