Chang, who secretly goes to play pachinko behind his family's back, hit a big jackpot today and got his hands on a large sum of money. To avoid suspicion from his wife about where the money came from, he tries to quietly spend it all at an ultra-high-class soapland... but lo and behold, who appears there but his mother-in-law! "What?! Is that you, Mother-in-Law?" "Why is Chang here!?" Chang is taken aback by his mother-in-law's unexpected side job. "If you keep today's events a secret... I'll make you feel incredibly good." Overcome by a moment of weakness, Chang is led into a swirling world of sensual pleasure by the ultra-slippery mattress play!
