NHDTC-199 This time! A flat-chested girl takes on the challenge of the men's bath. At a hot spring inn, a big-dick old man finds out she's a girl and cums inside her again... It's the worst! - Hikaru Minazuki

Those flat-chested girls who took on the challenge of wearing men's swimsuits are now taking on the challenge of wearing men's baths! They check into a hot spring inn dressed as men! Armed with a 'secret weapon' honed from their pool failures, they head into the men's bath! The tomboyish girls test their courage by wrapping only a towel around their waists! They're told not to put the towel in the bath... This might be even more dangerous than the pool (sweat). The embarrassing missions get more extreme! And at the end, once again...