Dark Star-Key last edited by
Writer: Hajime Kanzaka
Illustrator: Shoko Yoshinaka
Imprint: Fujimi Fantasia Bunko
This is essentially Kanzaka's spin on sci-fi, as his Slayers was on fantasy.
The story in the anime version was incomplete and I'd like to see the full original story. I even have copies of all five books, if needed.
Worth noting is that Canal's younger form looks very different, when compared her maid-like form in the anime.