Koji, an eternally mediocre salaryman. Today, he unusually won big at the horse races and decided to treat himself to a high-class soapland as a reward... only to find his mother-in-law there! "M-Mother-in-law!?" "K-Koji?!... Please, keep this a secret from everyone!" Forgetting his own situation of cheating on his wife, Koji was shocked by his mother-in-law's hidden side. "Coming to a place like this... Don't you think that's bad for her? If you keep it a secret, I'll give you an amazing service..." Although she is his wife's mother, he had been curious about her incredible voluptuous body. Unable to resist the temptation, he surrendered himself as told... and an unprecedented ultimate flesh-on-flesh technique began to envelop his entire body!!
