The anime ended, and you have a whole bunch of clues at your disposal now:
1. The anime itself
2. The
manga
3.
Frederica Bernkastel's Poems
4. The
TIPS
5. The great
Wikipedia article
6.
Your Qs Answered thread
7.
Putting the Pieces Together Thread (in progress)
8. And last but not least,
the translated game (if they are going to finish or not, of course)
Utilizing what you've learned, please discuss your thoughts and your theories about what really happened.