I'm a sucker for classical adventure stories with worlds like this one, and this manga almost makes you feel like you stepped out of a time machine into the 2000's. For some stories that can mean they feel dated, but so far with this one it seems like the author is taking mostly the good from back during that era when putting it together. So I'm really excited to see where this goes and how the story develops!
Solid opening, I'm definitely on board to see the various Afterframes and vehicles utilized to defend against Aquagorgers. Great potential for world building here.
Meh character designs, simple personalities, cliche plot, potentially ok world building, but the hoverboard is kino. If we get airships and a varied cast of characters, it could be pretty good. And by that I mean it should just become Eureka Seven.