I read this manga after reading Silver Diamond and I asked myself, why didn't I found this sooner? It's great really. You might be irked with the grammar on the first few scanlations (deal with it, at least there's someone willing to scanlate it), but the storyline is very good. There are cute moments, angst-ish moments and of course, touching moments.
There is plot, mind you ^__^. For you to see the plot of the story, you'll have to read volume 9 and later. And yes, you can say that the plot is slow but not without a good reason. I think that character building is one of the reason a story is good and it is good to spend more time on that. You can see how Ishuca cracks the ice-cold shell that surrounds Blood and why Blood is so attached to Ishuca. You can also see their past that makes them who they are now and how they strengthen their bond.
The art also improves later on in the story. You could see the improvements if you've been reading, It becomes more..beautiful. And dayum, Blood is one bishie I'd want to get my hands on. And I'd like Wild as a bonus if I can, those long, silky black hair are one to die for.
If you are a shounen-ai lover or just one who loves romance with spices of fantasy and action, you have to have this in your reading list.