My wife's mother secretly works at a super-high-class creampie specialist mature soapland: "Please keep it secret from all of my family..."

Masaru goes to pachinko with his family secretly. Today, I was a rare jackpot and got a lot of money. To prevent his wife from questioning the source of money, he secretly tries to use up at a super-high-class soapland... What appeared there was my wife's mother! "What!? You're stepmother... right?" "Why is Masa-kun here?!" Masa is left confused by his stepmother's unexpected secret business. "If you'll keep this secret for today... I'll make you feel the most comfortable." Masa, who has succumbed to a momentary insecurity, invites him into a tumultuous, sensual world with his super lotion matte play!