SKMJ-742 — Congratulations On Becoming A Working Adult! A Sister And Brother, Who Are Moving To Tokyo For Work, Try Taking A Family Bath Together For The First Time In 10 Years, With Only A Towel Between Them! They Shouldn't Be Conscious Of Each Other As Members Of The Opposite Sex, But They End Up Bathing Together In A Tiny Bathtub! The Extreme Mission Makes Them Aware Of Each Other... And The Close Brother And Sister End Up Having Unprotected Sex!

A close brother and sister take on the challenge! A forbidden intimate monitoring project! A man and a woman who were absolutely forbidden from having sex before moving to Tokyo are f** to share a small bathtub together for the first time in 10 years. Will they cross the line and have unprotected sex?! The brothers enter the bathtub in their true selves for a large cash prize! The two have grown into mature adult bodies. The thrilling mixed-sex bathing experience begins!