Ok, you might serach 'regedit' in your windows, open regedit, then find the floder: HKEY_CURRENT_USER\SOFTWARE\HotPink + Kamuo\Protecc Your Loli. Delete the 'Protecc Your Loli' folder, then you can start the game from the very beginning again.
Be careful, ensure you only delete the 'Protecc Your Loli' folder, don't delete somethings you are not supposed to delete in regedit.