Hi, Sandpixie!
Ah, yes. This was the complicated one! It's completely understandable if it takes your head for a spin. My answer to an ask here might help clear things up. (Warning: Has major spoilers!) There's also a rather helpful TVTropes page, I believe.
Now, if you're interested in learning more about the world of Beauty and the War (X Playing Pieces) without the psychological craziness, I might suggest playing War: Valentine Edition instead. Trust me, it's far more straightforward, very sweet, and a fan favorite. That is, if you like romantic comedies.