I'm surprised that there are so few reviews written about this series, but in a way I can understand it, since it's not a popular series. It's quite unfortunate, given how good it is compared to many other mangas with the fantasy world setting. This review is a spoiler-free one, so no need to worry about learning anything more than could be already read in the synopsis available on this manga's page on MyAnimeList. I tried my best to make sure that even such basic information is limited to the absolute minimum. STORY Without repeating what can be already read in the synopsis, I can only add toit that the story was enjoyable to follow. Readers are gradually exposed to new characters, places, or even themes, not being left with a feeling of confusion or overwhelmed with the amount of things happening at the same time. Storytelling is balanced, giving readers fair amount of calmer, more static scenes, as well as scenes more dynamic, filled to the brim with action.

ART
It's good (way above average, to be honest) and detailed enough to not only present beautiful landscapes, but also the author managed to grasp subtle details such as facial expressions. Akihito Tomi's panelling is something I felt was exceptionally great in this manga, aside from pleasant for eye art style. Scenes that were filled with action were totally enjoyable to read due to dynamism present in the art. As for other elements I exceptionally like, I'd mention fanservice. It was subtle and blended with the plot or characters, not leaving a feeling of being forced as usually fanservice panels in most of mangas tend to do. So if you do not like such elements, then I'd recommend giving Isai no Hime a try, since fanservice elements it has are hmm... refined? I think this word might fit here well.

CHARACTERS
The whole cast is full of likeable characters having their own goals, duties, and of course unique designs. One might feel that most of the characters don't get enough of attention from the author, but if we take into account the length of this manga and how it wants to mostly tell the story of Claria/Queen Vivian, it doesn't look half bad. In fact, it looks very good, given how many characters are there and how fast we can learn basic things about them. However, if you expect to see several supercomplex backstories of both protagonists and antagonists, then no, you will not find them here.

ENJOYMENT
While the overall enjoyment is a subjective thing, as for me, I say I had a lot of fun while reading Stravaganza: Isai no Hime. I got hooked to the story and completely soaked into it, ending up with finishing reading the whole manga rather fast, at least the first six volumes of it (seventh one is important for the plot as well, however it focuses more on side stories).

SUMMARY
In conclusion, I recommend reading Stravaganza: The Queen in the Iron Mask, especially if you like well told stories filled with high fantasy elements.