♨ Monster Girls Onsen is out now!

26 Sep 2025Developer post

Source: Steam Community (opens in a new tab)

The old onsen has opened its doors — steamy nights and hidden secrets await you.
🔑 To celebrate the launch, we’re giving away keys — grab yours while you can!

9HGV3-6HDZ0-IP5TA
3XE5I-HNLTV-V9LBM
QJHE4-J5K42-5JT3M
8FRNH-6KFLN-N3B6X
A0C5W-6PBB8-WI79F
TI0Q5-9K569-GAAZH
H5XNC-WDMIY-BWFQM
R7PPI-PJXRR-GCMTM
RXXWV-773N4-82XQH
WPH3E-IGIDG-TXXRT

https://store.steampowered.com/app/3915230

📅 Another upcoming games

https://store.steampowered.com/app/3677020
https://store.steampowered.com/app/3959100
https://store.steampowered.com/app/3899620
https://store.steampowered.com/app/3870580
https://store.steampowered.com/app/3994260

Build and release context

Steam update times within 24 hours of this post. Matching dates do not confirm which build it describes.

Build 20143226 · public branch
Steam updated 26 Sep 2025, 13:38 · First observed 13 Sep 2026, 05:05

Recorded Steam release date: Sep 26, 2025

Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.