I'm a big fan of Narutaru.
While watching an AMV on youtube, a person left a comment saying that the anime didn't continue because the manga ran out of money & couldn't go any further. Factual accuracy is disputed, of course.
As for the manga, only 7 of the 12 volumes have been translated into English. The 7th volume was Victim's Eyes, Assailant's Hands (this was the ending arc of the anime). I haven't read the manga, but, over 5 volumes, the manga probably progressed farther than the anime did.http://en.wikipedia.org/wiki/Shadow_Star#Manga
I was upset too! I really wanted to know about the birth of dragons, and who that ominous girl on the giant dragon was!