Tropical night new chapter! - It's summer, about three years have passed since my second son, Nanami, and I got married. - My brother, who had left saying he would not inherit the house, returned to the sound of cicadas. - Since then, my wife has been acting strangely. - Even though I didn't think anything strange was going on with my wife, I got worried and set up a camera to record what happened when I was away. - What was reflected there were beads of sweat, shiny lips, hair clinging to the skin... - A wife who resists but gradually accepts and interacts with her older brother who is lustful. - My wife believed in me...