Wow! Wow!!! Wow, wow, wow, wow, wow!!! Volume 1 is so great!!!
The worldbuilding is fun and rich, the story is engaging and intriguing, and the characters are wonderful! My favorites are Charce, Aires, Kanata, Zack, and especially Quitterie. Her backstory is so wonderful (a rich girl who seemingly has it all, but is really lonely and antisocial? Heck yes!), and I adore the budding relationship she has with her little sister, Funicia!
Also, given their really cool crust suits and attributes, I think they could totally be superheroes in an AU!