Gakusei Papa to Oishii Otoko

Akiyuki, a college student and father, brought his twin daughters Remon and Mikan to a bathhouse. He was struggling with the children, who were frolicking around the bathhouse for the first time, when a tough-looking man called out. Akiyuki instinctively protected his children, but his twin daughters took to the tough-looking but gentle man immediately...?