The official English localization sometimes contains awkward "Engrish" or errors—such as the game telling you that you lost a battle when you actually won.
Unlike modern games with easy-to-use Steam Workshop support, modding often requires third-party tools found in community forums. Tool / Resource pmr_dat_tools Princess Maker 2 Refine Mod
If you want to swap the daughter's character portraits or backgrounds, follow these general steps using pmr_dat_tools : Princess Maker 2 Refine Mod
Extracts and repacks .dat files to allow custom image modding. Steam Community Princess Maker 2 Refine Mod