Uchi no Musume no Tame naraba, Ore wa Moshikashitara Maou mo Taoseru kamo Shirenai. (If It's for My Daughter, I'd Even Defeat a Demon Lord.)
Dale is a well-known and highly skilled adventurer despite being so young. One day, he's on a quest and goes deep into the woods and finds a little devil girl named Latina, who is just skin and bones.
Latina is branded with the mark of a sinner, but Dale decides he can't just leave Latina there and decides to become her guardian.
Thinking to himself, "Latina is too cute, I don't want to work," he ends up doting over her before he even realizes it.