At first I thought it was the mangaka who make "Hakumei to Mikochi"...then I started getting "Little Witch Nana" vibes, but really, they are their own artist, and I very, very much enjoyed this. The mixing of modern and fantastical medieval, the magical school, the faces and designs...just the very way her head sort of is slumped or tilted forward on her neck in the last panel. It's quite incredible.