Miss Kobayashi's Dragon Maid

Miss Kobayashi is your average office worker who lives a boring life, alone in her small apartment–until she saves the life of a female dragon in distress. The dragon, named Tohru, has the ability to magically transform into an adorable human girl (albeit with horns and a long tail), who will do anything to pay off her debt of gratitude, whether Miss Kobayashi likes it or not. <em class=de-emphasized>(from manga)</em>

Synopsis from Anime News Network