If you aren't the fan of Hataraku Maou-sama than it will be fun for you, its story is same as Hataraku Maou-sama but with some twist and ecchiness (though it is very little)
The story start at a Family Restaurant where our Main Protagonist who work with some hot chicks.
Here enter our Heroine Cute and Hungry Demon Lord who want to work there so that she can afford her own food. She saves our Hero and get hired and the story of Demon Lord working on a restaurant begins.
As for an Ecchi manga, the art is pretty good compare to some hardcore ecchi mangas. Character design is good as well and detailing fine to.