Overview
Simple fix so you can save the game 🙂
The fix
Basically when saving it tries to create a folder called “savedata” in its main data directory. However due to the game by default not having write access on its own directory this fails and the game can’t create any save data.
To fix this simply go to:
[WhereverSteamIsOnYourPC]SteamSteamAppscommonNeptunia U
and manually create a folder called “savedata” there.
After that the game should be able to save normally.