The bride lives with her husband and father-in-law. Attracted by her husband's seriousness, she got married, but she was not having sex because of her work. She becomes attracted to her father-in-law, who treats her kindly at such times. One day, her daughter-in-law learns from the news that her father-in-law and her husband have the same blood type. She is a daughter-in-law who thinks immoral thoughts even though she hesitates, "If the blood type is the same... but..." Furthermore, after seeing her husband's child-hating coming out and her father-in-law masturbating in her daughter-in-law's underwear, her daughter-in-law decides to seduce her father-in-law into having an affair with her. From then on, she, she, like a kite with a broken string, repeats the love affair over and over again, and she finally... immoral, forbidden inbreeding.
