Mary is frustrated with her husband who won't let her have sex because he's too busy.At the hospital, she was diagnosed with a low sperm count, and although there was a non-zero chance of her becoming pregnant, it would be difficult unless a miracle happened.One day, her husband's father came to visit Tokyo and decided to stay the night.Her father-in-law was also looking forward to her grandchild, so he was unable to bring up his concerns.Mary's father-in-law, who unexpectedly finds out about her son's situation, injects Mary with an aphrodisiac.Her stepfather asks her if she is really satisfied with having sex with his son.It was her father-in-law who violated Mary and creampied her, saying he would take responsibility as her parent.Mary became horny due to her father-in-law's repeated use of aphrodisiacs, and began to desire her father-in-law instead of her husband.