I wonder if you are getting the mangas confused with the novels...
I thought there were two Novels and three mangas ( one screwed over because of the artist quitting)
but actually, I wrote a script based on the first novel. VERY loosely based because as blood knight said, they aren't canon. fortunately I was able to tweak some aspect of the novel to make it fit seamlessly with the DMC storyline. the script is almost nearly completed, and I hope to contact someone about getting it made..bwhahah...I've got a thread for it on the Devil may cry movie section, its title "Devil may cry: Blood vengeance" go check it out