Celebrating Newcomers to the Workforce! A younger sister and her brother, who are moving to Tokyo for work, try taking a family bath for the first time in 10 years with just a towel! They are not supposed to be conscious of each other as the opposite sex, but they are closely mixed in a small bath! The extreme mission made them aware of each other and the brother and sister, who are good friends, had sex live in the bathtub!