Here to both answer your question and ask you to please tag your post.

I'm not the best with Japanese but I have a more reliable translator and a dictionary and I can look at the last sentence better. It doesn't say last but at last, as in "Finally."

The last line says "HetaliaxTravel Book, Germany Volume is finally introduced!"
Or something to that effect. Nothing about it being the last in the series. (We haven't even gotten to the rest of the Allies yet! We need to all of them at the least, and I don't think he's covering Japan.)