Worried about her aging father, she and her father-in-law decided to live together. My father-in-law couldn't help but worry about his beautiful daughter-in-law, Kaori. Every day I look into the bath of incense. …… One day, when I looked into SEX with my son, I saw Kaori masturbating next to my sleeping son after SEX …. Feeling unsatisfied with sex with his son, Toru goes to Kaori the next day.