Konyoku Sauna de Joshi Mane to Asedaku Ecchi: Kore Ijou wa... Minna ni Barechau...!

"No, I can't keep my voice down...!" Rubbing your sweaty boobs makes you even wetter down there... Things are heating up in this co-ed sauna!
(Source: Coolmic)
Note: Simultaneously released in long-strip and traditional formats, with 18 episodes and 6 chapters respectively.