@ TazoJiadze
The author of this comic is different from the artist, presumably because the artist is a good artist but recognizes his/her limits as an author. I assume the author was hired to write the script for it as an original work. If the comic is a large commercial success, it might get converted to a different media. Most popular light novels are made into comics because the publishers see it as a guaranteed money maker as the fan of the novel will most likely buy the comic too.
So short answer is, there is no novel if there is no money to be made.