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The father-in-law was worried...why could he not produce an important heir? One day, he accidentally witnessed his son and wife having sex and became convinced. That's right...his son has poor abilities as a "man"...The father-in-law decided to impregnate him in his son's place. At first, Reiko desperately resisted rationally, but... eventually her instincts awakened and she became a "female" in front of her father-in-law. However, she was witnessed by her husband. What action did the enraged husband take? A deviant love story in which a family that has fallen apart according to common sense is strongly bound together by the bond between "female" and "man". How will this end...?