If you are looking to modify student stats like height or BWH, you can use the Character Editor by Kirara Kurashiki.
Open the .zip file and extract its contents into the appropriate subfolder (often \GG2Game\CookedPC\ ).
This package contains [insert what is inside, e.g., the high-resolution texture pack, character editor, or complete save data]. Installation Instructions:
For Steam users, the default is usually C:\Program Files (x86)\Steam\steamapps\common\GalGun Double Peace . You can find this easily by right-clicking the game in your Steam Library and selecting Browse local files .