Masaru has been playing pachinko in secret from his family. Today, he hits the jackpot and wins a lot of money. In order to avoid his wife suspecting the source of the money, he plans to spend it all in a high-class soapland, but... his wife's mother appears! "What?! You're my mother-in-law, right?" "Why is Masaru here?!" Masaru is dumbfounded by his mother-in-law's unexpected secret business. "If you keep what happened today a secret... I'll make you feel amazing." After succumbing to his momentary lapse, Masaru is led into a dizzying world of sensual action by an incredible lotion mat play!