Oh man, this was so good, I couldn't read fiction after it and had to go read Hofstadter for a while before I was willing to let go of the characters and invest myself in another narrative.
Also,

I ship Alucard and Rhy SO HARD you guys! Please don't kill the gay beta couple. The last thing this amazing series needs is to kill its gays. Please let them live and be happy at the end!

Love when the books in a series only get better.