Well there is no need to tell what's the story about since this is already written.
I liked reading this manga but I have mixed feelings about it.
My first manga I read about "demonlove" was hanatsuki hime.
This is my second one.

What I liked about the manga is how the relationship between Hana & Vivi develops.
At the same time it was strange because you would expect it would only by a "father-daughter" relationship.

Sometimes I almost forget that most of the characters are demons.
This is because the author made the characters look more like humans ..the way they feel...think etc.
Even the demob king himself looked like a human !

I like how the artist payed attention to the design of some things.
She portrayed hana and her feelings very well.

Sometimes there are pretty examples or situations that at the same time refer to the feelings or relationship of Hana and vivi.