If you are using the HF Patch for VR Kanojo , ensure your save file is compatible with the version of the patch you have installed, as major updates can sometimes change save structures.
If the game fails to load or progresses improperly after installing a save, verify the game files on Steam and reinstall the latest HF Patch from Patreon or GitHub. HF Patch for VR Kanojo (original Steam version) - GitHub vr kanojo save file install