Why Shouldn't a Detestable Demon Lord Fall in Love?!Kiraware Maou ga Botsuraku Reijou to Koi ni Ochite Nani ga Warui!; 嫌われ魔王が没落令嬢と恋に落ちて何が悪い！; 被讨厌的魔王和没落大小姐谈恋爱有什么不对吗

This is the story of a detestable Demon Lord and his wonderful new wife, a destitute damsel! Our Demon Lord, Anima, is the strongest in all the world, feared by the denizens of the realm. He's forced to spend his days in solitude until, completely out of the blue, he gets summoned to another world! The one who summons him is none other than Luina, an exceedingly poor girl who runs an orphanage. The two of them quickly fall in love, with Anima swearing to use his power to protect his newfound family!