Keep Your Hands Off Eizouken! - Vol. 2 Ch. 13 - Relaxing At Ongyoku Bathhouse

[MangaDex]

 

[Laparoscopic]

Traditionally in manga, the bath house scenes are excuses for fan service. Here, they're excuses for observing the fluid nature of water and showing Mizusaki's inexperience with much of the real world ("Can I take pictures?""Absolutely not!").