If the last version you played was v0.22, there has been a big overhaul overall with the UI, including added manual saves. These are probably the most notable new things in the current Steam build:
- 1x New hotel invite with Mai and Professor Belmont (Threesome)
- 4x New hangouts with Sara, Toshiko, Satomi and Mai
- New part-time job mini-game in Ramen-san.
- New hotel guest animation.