Hikari, who is troubled by the lack of sex in her marriage, is one day proposed by her husband to join a 'wife-swapping club.' Although she strongly opposes this unfamiliar and suspicious group, she eventually gives in after being persuaded by her husband. Immediately, she finds herself having sex with another couple. Initially, Hikari refuses, but as she becomes addicted to the pleasure she can't feel with her husband...this woman, who has been conquered by his penis, becomes engulfed in sex.
