Being a hardcore Disney fan, I just had to read this. The premise sounded, well, not very deep or as subtly meaningful as I expect real Disneys to be, but well, I still bought the whole set (the manga was published in Germany). Kilala is a Disney Princess fanatic and she would do anything to be like her idols. Through completely unrealistic circumstances that make little to no sense, she encounters Prince Rei of Paradisos and launches into an adventure with him to find the seventh Princess (the first six being Disney Princesses that Kilala and Rei meet while travelling through different Disney Worlds).
Kilala Princess is epically corny and has no meaning or depth beyond Kilala being happy about meeting her idols and being a notorious goody-goody with no character development whatsoever. She is so underdevelopped that all interaction with the Prncesses felt forced, and I felt really bad for the poor Disney characters. Rei and Silvia (the inevitable fiancée) were just like Kilala in that department. Instead of having layered personalities with actual motives, they stayed bland and hollow for the complete series, never gaining any depth.
Another thing that bothered me was the drawing style. While the artist managed the depiction of the Disney characters beautifully and true to the originals, Kilala and the other "new" characters clashed with the Disney style. While the individual Disney characters didn't necessarily have the same style, they still kind of fit with each other. Kilala and her peers, however, looked horrible misplaced and awkward within the Disney settings, and I was quite dissatisfied with that.
Apart from that, it was an enjoyable but shallow read.