The story is quite simple, normal and doesn't have a deep character development, what you expect generally from a Romcom, but the characters makes the story very enjoyable and light.
At first, let's start talking about the Main Character, Haru, he's a very straightfoward character that don't hesitate in declare his feelings for the Main Heroine, The Demon Queen Eleanor, and summed with hers reactions, makes a very funny and enjoyable story.
If you are into Romcom, you'll probably like this manga, it may not have the greatest story with the biggest plots, but I'm sure that it won't be waste of your time.