This role-play is performed by adults. Mio has been loved by university professor Sugiura for many years in his economics seminar. Thanks to Sugiura's guidance, he rose to the rank of associate professor. At that time, Sugiura's wife passed away, and at her funeral, he met and married his son, Yuuji. She is currently taking a leave of absence from university to try to get pregnant. Although she is trying hard to conceive, she is not seeing any signs of pregnancy, so when she sends her husband's sperm for a test, it is discovered that he has azoospermia. At that moment, Sugiura, his mentor and father-in-law, whom he admired, flashed through his mind. The physical relationship with Sugiura that she had fantasized about many times, and now that bad fantasy has become a reality.