The wife lives with her husband and his father. She married because she was drawn to her serious and honest husband, but their relationship turned sexless due to his demanding job. During this time, she gradually falls for her kind and attentive father-in-law. One day, she learns from the news that her husband and father-in-law share the same blood type. Though unsettled, immoral desires begin to stir within her. When she discovers her husband hates children and catches her father-in-law masturbating with her underwear, she starts seducing him. From then on, like a kite with a broken string, they repeatedly indulge in passionate affairs, ultimately descending into the ultimate taboo—incest, pregnancy-seeking, and animalistic mating.