Ahhhh I was wondering why they weren't wrapping things up even though it got the axe, it makes sense if it's an adaption. Of course, if there are only 2 LN volumes those likely sold poorly as well
Edit: Yeah the LN solds pretty badly, volume 1 only has around 200 ratings on Amazon. Generally even a moderately succussful series will have 500-800 ratings on Volume 1. The Manga actually did decently, but it was also Young Jump publishing it, it might have lasted a lot longer if it wasn't published by them