On a hot summer day, my wife was in bed with a summer cold, so my kind sister-in-law came to help me with the housework. - Furthermore, through a series of coincidences, my sister-in-law Rin, who works overseas, also returned from Japan for a short period of time. - Then, a strange life began at my wife's parents' house with my two sisters-in-law, whose breasts were incomparably bigger than my small-breasted wife. - I had to sleep next to my two sisters-in-law because I was catching a cold, but I couldn't sleep because my breasts were pressed against my left and right sides...