Kazama Yumi plays a beloved mother who becomes the victim of a cruel prank during spring break. Two friends make a forbidden contract to "swap" their mothers. The immorality of accepting the young, unreserved penis of another man's son deep inside her body. Even though she senses a resemblance to her son, her body trembles with humiliation as her womb is filled with semen from someone other than her husband. However, her experienced body cannot resist the passionate thrusts of the young man, and she gradually begins to let out lascivious moans. This is the ultimate immoral epic from the Madonna label, depicting how domestic order collapses due to the contamination of semen.