I have a question:
Why is Subaru so involved ?
I mean, he started as a shut-in player. He thought that was a nice game.
But now, he's so involved he's borderline -or already- crazy.

Emilia/Rem aren't sufficient explanation.
I thought it could be the death and associated pain experiences. I also understand he tries his best to get out of each loop.
But really his attitude is incredibly far from the one he had at first.