Hikari, who had begun struggling with her marital relationship, is one day proposed by her husband to join a spouse-swapping club. Initially shocked and strongly opposed to the idea, she eventually gives in after his persistent persuasion. At first hesitant and uncertain about the unexpected turn of events, she gradually awakens to pleasure through intimacy with a new partner, experiencing sensations she had never felt with her husband. Soon, she becomes addicted to this pleasure, losing herself completely and forgetting the relationship she once had with her husband.