The fact that there are still wars around and the hint that Hakuoro is returning leaves open the room for a possible sequel.
They did not go much into the detail of how and why Hakuoro was fighting and injured enough to make a contract with Eruruu, even though Dii said they are not supposed to meet.
Furthermore, they barely touched the subject of the petrified being that gave Hakuoro his mask.
Also, for supposedly really intelligent beings, I find the scientists quite dumb to not realize human feelings, dissecting poor Mikoto and having the nerve to tell her "husband" about it casually.
The ending was too fast and felt really rushed, so it was a little confusing at some parts. Overall, it is one of the better ending to a series, and the series is one of the better ones as well.
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