ROE-489 During the day, my wife's mother is plain and introverted, but in reality... she's a nymphomaniac who secretly goes to clubs on weekends and has affairs with young men.

Kakeru, the son-in-law, feels a great deal of sympathy for his mother-in-law, Satsuki, who is usually quiet and submissive to her domineering father-in-law. One day, Kakeru spots a flashy woman who looks very much like Satsuki and impulsively follows her, only to find... Satsuki dancing wildly in revealing clothing! Kakeru is shocked by her unrestrained behavior, which is completely unexpected from her usual calm and quiet demeanor, and he can't help but call out to her...