It's not just "another" mecha series.
Having read the manga I can say for sure, that although it definitly has shounen staples - heroes struggling with destiny, duty and "learning powerlevels"...ok not that. Although there are a fair number of badasses in the story who kick ass.
However all of this is tempered by a more languid, soft characterization that really has shoujo vibes going all through it. People are more likely to have a quiet conversation and deep moments together than straight out shouting matches of burning passion...
...all in all, this one, you should keep an eye on.
This could be one of the best action-adventure series since Escaflowne.