For the longest time I'm sooo confused why the manga looks absolutely nothing like the novel version. Cause if you look at the novel, it had blonde small girl in the cover and the synopsis is about MC being princess and Saint. But the manga is about demon living in modern japan. I legitimately thought both of these are two completely different series that have the exact same name.
That's when I finally read the novel I learn that the manga (for whatever reason) starts in from the middle. I haven't read the Part 2 Japan arc yet but the Part 1 was honestly really entertaining. Especially the part where you see the contrast between the MC and Demon. The MC is so human and yet still a demon, and still a demon despite being so human. It was really cool how none of the Demon could tell the MC is a demon in human body because she behave that of a human. She was a demon who love, cry, feel joy alongside human.
I was genuinely hoping you would see how her human friends would act when learning their little Saint was actually a powerful yet (relatively) harmless demon.