Chapter Counts and Alternate Versions (Spoilers)

[Mattrex]

I have finished one loop of the game, and have seen five princesses. One of these was the Razor, whose story was told in four chapters:

I. The Hero and the Princess
II. The Razor
III. The Arms Race
IV. Mutually Assured Destruction

When I completed it, I got the achievement for bringing the Razor (Full) to Her.

Every other princess I completed had only two chapters, the first one of which was always "The Hero and the Princess" and the second of which was always the princess' title.

Does every princess have some hidden condition to unlock a "Full" or alternate version that goes a full four chapters like the Razor did for me? Is it a coincidence that the first one I completed was the only one that had four chapters, or did I just miss some unlock condition in the next four princesses?

Or is it the case that the first princess *anyone* does have four chapters, and all the rest have only two?

[Zeox]

If in the second chapter, you kill the princess or she kills you, you can get a third chapter. But that's it, only the razor has a 4 chapter.

[Havean]

From what I've done it seems most have 2 or 2 and a little. Only the Razor had 4.

[Green Legion]

Most, if not all, of the routes can go to a Chapter 3. However the Razor is the only one which goes to Chapter 4. And, I'm almost certain the Razor will always go to Chapter 4 no matter what you do- while the others can be ended on Chapter 2.