I'm the Demon Lord, but For Some Reason the Hero's Infatuated With Me

Upon receiving a royal decree, the hero Oliver and his party set off to defeat the Demon Lord, who ends up having no way of matching the hero's overwhelming strength... But it just so happened that Cecilia (the Demon Lord) was cute enough to make the hero's heart flutter to bits!! In the end, Oliver decides to ignore the royal decree and take Cecilia home with him. Thus begins Oliver and Cecilia's strange new life together. Oliver tries his best to win Cecilia's heart, but she finds it hard to think of herself as anything but a prisoner... Despite the fact that she's surrounded by sweets, delicious tea, and gets everything she wants. When is she going to realize she's completely misunderstanding things?! Enjoy the ultimate awkward/misunderstanding-filled love comedy!

(Source: MangaPlaza)