``The physical relationship between me and my sister...no words needed'' One day, my parents remarried...and the other's stepchild 'Ichika' came to the house as my sister-in-law. - Suddenly, I find myself living with my sister, who is cute but not related to me by blood. - I can't help but be conscious of naughty things. - Then one day, while my parents were out, I was alone with my sister...I became more conscious than usual, and when I looked over, I noticed that my sister was also conscious...and the two of us remained silent, without any conversation. - The atmosphere alone leads to action. - That's when the physical relationship between me and my sister began, in which ``as soon as our eyes met, we silently fucked each other like monkeys.''