idk if the manga covers it. I do own the first volume of it, though I never read manga. ... er ... except when I do. Anyhow, volume one only seemed to cover most of the first novel. So there would/will end up being a lot more issues of the manga than the novels. After a quick wiki ctrl+f, the two don't even meet Norah until manga 4, but she is introduced in novel 2!
I don't know exactly how it ends, though I have come across many spoilers. In fact Hasekura-san has begun to write a sequel series that takes place after the last S&W novel. If you don't want the same spoilers, don't look at the book on amazon.
More books in general or more books in-line with the ones you've just read?
Start flipping switches and moan like a ghost.