Here's the Save File for full CG gallery v1.61. If you also want to replace System.sav it should unlock even the second route (I think), but the name of your MC will be different from the one you have chosen at the beginning of the first route (if you want to change the name do it by purchasing the name changer item from the black merchant near the Hideout). Replacing System.sav is completely optional if you want to just savor the game normally.
PS - Reminder: replacing System.sav should change your game launcher, which will show you a variation related to the end of the game (it needs context to be understood by still I shall warn you).