Furo Sommelier Tenten Corporation Nyuuyokuzai Kaihatsushitsu

Yuimi, who works at the reception desk at the Tenten Corporation Research Institute, is a big bath lover. One day, she is suddenly approached by a naked beauty at her favorite super public bath. That's how she met Mizuki Kagami, a researcher at the research institute. (Source: Shueisha, translated) Note: Includes one extra chapter.