I'm so sorry to hear that since I know how much you love DR; its really too bad that Renjou/Kei is the main pairing in fandom since good fanfic is often the best comfort for this. At least thought there's two more volumes instead of just one.

Interesting details about the castle; I for one would love more details on Kagekatsu and his relationship with Kagetora due in no small part to Cerise Tennyo's excellent prequel fic some of which you can access on the fic recs link that Lady_Nara posted on mirageofblaze.