Good stuff. I like that it didn't go all edgelord-everyone-dies-pointlessly despite the heavy themes. Reiri seems content; everything fits pretty reasonably into actual history. Yeah, sure, could have maybe have had a bit more to The End (I think the story was strongest a few chapters before the finale) but it was fine.
Wow, the ending, even though still tragic, ended up better than i thought.
I am glad that Reiri has survived and now lives her life without being devoted to someone (if i didn't misinterpret the ending).
I think that was a great ending. It gave Reiri the ending she deserved, not the one she wanted.
Plus I like how it keeps it somewhat historically accurate while still having the ability to play around. 10/10 series.