Please note that the save system changed in v0.24, and thus any saves in older builds will not work with the latest versions of the game.
However, if you are trying to move your saves within the new system (v0.24 or later), you can find the save files here:
- WINDOWS SAVE FILE FOLDER: C:\Users\Username\AppData\LocalLow\Oppai Games\Quickie_ A Love Hotel Story
- MAC SAVE FILE FOLDER: ~/Library/Application Support/com.OppaiGames.QuickieALoveHotelStory
- ANDROID SAVE FILE FOLDER: /storage/emulated/0/Android/data/com.OppaiGames.QuickieALoveHotelStory/files
Hope this helps!