I got tired of generating background assets where the furniture moved or the window changed shape between time variants. It breaks immersion in Visual Novels.

So, I developed a strict "Sketch-to-Image" workflow to lock the geometry.

As you can see, the walls, desks, and perspective stay 100% identical.

If you need consistent assets for your project, I just released my first pack using this technique:

https://consistent2d.itch.io/anime-school-backgrounds-vol-1