Why Shouldn't a Detestable Demon Lord Fall in Love?! Volume 1

Anima is an immensely powerful Demon Lord, so he spends his days living in solitude...right up until he’s summoned to another world out of the blue! The person who summons him is Luina, a poor girl who has her hands full running an orphanage. Anima quickly falls for her and, in a first for him, learns what it’s like to be surrounded by loved ones. With Luina by his side, the detestable Demon Lord now vows only to use his fearsome powers to protect his newfound family!

[From J-Novel Club]