what about netorase route?
Stay on pure route until you get to the king's castle (level 23 I think?), then let Gwen get groped a lot by the other guys while escaping the castle's dungeon. That should trigger the netorase scene.
Important to note, the "Hero" ending is the one that better matches the "pure route", to get the Hero ending you need to prevent both Gwen and Vivian from being corrupted (to prevent Vivian from being corrupted, do not summon Cythraul robots after she gets a chip implanted on her).
If Gwen is pure and Vivian is corrupted, you get the "Soldier" ending, which better matches a "netorase route", because the ending has a scene that changes entirely depending on if you had the netorase scene or not.