Ayano, a mother, takes care of her son-in-law, Takao, in place of her daughter who left home to work overseas. Living with my son-in-law was fun, but I sometimes felt frustrated because I couldn't bring my boyfriend with me. One day, I got excited on the phone with my boyfriend for the first time in a long time, and I couldn't help but start masturbating over the phone. What's more, Takao happened to come home and saw what was going on... When Takao sees his mother-in-law's lewd behavior for the first time, he can't control his desire and comes up with a plan to make her ripe body his own.