An Archdemon's Dilemma: How to Love Your Elf Bride Maou no Ore ga Dorei Elf wo Yome ni Shitanda ga, Dou Medereba Ii? English Subbed

Zagan might be the most feared evil sorcerer, but when it comes to social interactions, he’s the most inept. All those days studying the dark arts won’t help him when he falls in love at first sight with Nephelia, the beautiful elven slave, and spends his entire fortune to purchase her. With no clue how to talk to each other, the awkward arrangement for a bumbling sorcerer and timid elf begins. (Source: Crunchyroll)