User blog comment:B214/Volume 23 discussion blog/@comment-201.18.245.30-20170417132540/@comment-9595671-20170417141241

I've seen a lot of LN that have atleast 20 volumes, but getting most of it adapted to anime? That's harder and DxD is about to hit a Season 4, but plans to try reaching six seasons.

So I'm gonna say... yeah, it's a great success.