Cryton_Valance wrote:I'm aware of how acclaimed this series has become and now with the releases of the two premium sets I have recently been pondering whether they would be worth buying,
Yes. I certainly think so. It's an excellent series. (Of course you know you're asking a biased audience here.

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Cryton_Valance wrote:in spite of the series being unfinished. I've heard that the main protagonist's story is conluded by the final episode so does the series feel complete in someway?
In the original novels, there are a whole collection of different but interrelated stories about the Twelve Kingdoms, and several of them are included in the anime. The anime finishes all of the stories that it starts, so yes, it does feel complete, at least for the most part. The reason it's refered to as being incomplete is that there is another story that they had originally wanted to include in the anime, but the novels for that story were to be published in two parts and only the first of those novels was ever finished, so they stopped the anime before going into that story.
The anime does include an arc called
"Sea of the Wind, Shore of the Labyrinth" about a young kirin, Taiki, and his search for a new ruler for the kingdom of Tai. This story itself is complete, but it's the most closely related to the incomplete story which is
not included in the anime. That story is set several years later, but because when the
"Sea of the Wind, Shore of the Labyrinth" arc was being animated, they were still planning on including that story as well, a few hints or teasers about it were included. So the anime tells us that several years after the events we're shown, Taiki and his new emperor are both missing, and that at least Taiki ended up back in our own world, in Japan. But the story of what led up to that, how it happened, and how Taiki and his emperor were finally recovered and brought back to Tai - that story is
not included in the anime because only the first half of it was completed in the novels.
Cryton_Valance wrote:And one final question; does it appear likely that they will continue this series in the near future?
In the near future - no, they won't. The book they had wanted to base the next arc on hasn't been written yet. Someday - well, we're all hoping so. In order for that to happen, first the author, Fuyumi Ono, would need to complete the sequel to her novel
"Tasogare no Kishi, Akatsuki no Sora". I don't know how likely that is. It was written several years ago and she's gone on to other series since then. There is a large Japanese fan-base for Juuni Kokki asking her to continue with it, but her newer works also have a large fan-base. It's really going to come down to what she herself has the most ideas for and is the most interested in writing, and we don't know when or if her interests will return to this series. If she does come back to it and complete that sequel, then the animation company would have to consider whether they want to go back to continue an old anime from several years ago rather than start a new one. We're all hoping they will, but it's not something that's going to happen soon.