I am married to a divorced man with children, and we live together as a family of four: my husband's older brother and my son-in-law. In recent years, the number of times we have sex at night has drastically decreased, but I was otherwise not particularly dissatisfied with my married life. Then, one day, my brother-in-law, who had retired and was at home, suddenly attacked me... He may have been lonely after losing his wife three years ago. I somehow managed to get through the situation, but this was the beginning of a strange family relationship...