I read this on a whim due to my how much I enjoyed the look of the main character and the art of Yukiru Sugisaki in general, and I can assure you I was not displeased.
Story: It's simple and is something seen so many times before, but it's written in a way that makes it feel fresh and unique. It can be a bit dark in dealing with the topic of racism, it doesn't take away from the overall sweetness of this series.
Art: The art, as I mentioned earlier, is something I'm quite fond of and the entire reason I read this manga in
the first place, especially since Yukiru Sugisaki is my all time favorite mangaka when it comes to art. It has a unique and "cartoony" look to it, while still maintaining the "anime/manga" vibe, which is something I enjoy about the other works of the creator.
Characters: The characters are what stand out the least to me, Minii, while being one of my favorite characters in all of anime and manga, is simple, but that simplicity works for her since the story is quite simple as well, her design is probably my favorite part about her character. Her friend character is far from memorable, i can't even remember his name, though he isn't bad, but he isn't great either. As for the other characters such as the prince, I've only read 1 chapter and don't know much about them, though from what I see, their character and personalities seem to compliment that of Minii's.
Enjoyment: I had an absolute blast reading this manga, the simplicity of it allowed me to take a few moments to just relax, unwind, and get sucked into the story.
Overall: All in all, I recommend this series to those who enjoy sweet and simple things, or would just like a quick read. The MC is cute and I found myself smiling while reading it. Definitely check it out if you have a little bit of free time!