The novels are mostly about drama and feelings; this is a shoujo novel series after all. Like how Vols 7-8 is about how Filmina's pregnancy is being tarnished by vicious rumours the child will be a demon king, because of Edi's reputation. Or how Vol 9 is about Filmina's twin daughters being loved by the spirits; so Filmina can't approach them because of the anti-spirit scar on her back and the heartbreak it causes her. The synopses all say it's a very popular novel series (with its target female readers).
http://www.ichijinsha.co.jp/special/iris/mahotsukai/