I've just found a way to decrypt a save file for this game, I've found a tool and guessed the password for encryption (took me a grand total of 4 attempts lol).
It's a unity game and it's using "easy save 3" save format.
Save is located in: <game_directory>/newona_Data/savedata
I used this tool to decrypt data:
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encryption password: moralist
I've just found this out and plan to cook up a true 100% save file for this game when I have time (as far as I'm aware nobody managed to unlock full gallery for this game).
I will leave this info here though, somebody might beat me to it.