Sharing this nice little tool made by Froggus from ULMF source [ulmf.org]
If you don't have account on ULMF, you can download editor here [drive.google.com]
Works with any RPG Maker MV, VX/VX Ace and XP games.

Princess & Conquest is made on VX Ace and fully compatible with this editor.

1. Download and put RpgMakerSaveEdit.exe in the game main folder.
2. Move .rvdata2 save file from Saves folder to game main folder, otherwise editor won't see anything but MC stats.
3. Do your cheaty stuff.
4. Close with "Save and Exit".
5. Move save file back to Saves folder.

By default, only Party and Items tabs are available. At Party tab don't touch anything but MC stats, otherwise weird things may happen. Swirlies are not "Gold".
Feel free to edit items, except for adding blank and placeholders. That tab contain all in-game items, including no longer available and some service stuff.

Most of the things at Items tab are pretty self-explanatory:

You can additionally enable Switches and Variables tabs for neat magic like:
- Edit Kingdoms affinity and princesses love;
- Manage Kingdoms lewdness and life force;
- Resurrect dead Princesses;
- Many other things.

Don't forget to make backup saves if you are going to change Switches and Variables.