I wonder what houses the other girls are in.
Kaoruko is pretty brilliant, but a bit too lazy to stick her neck out for conflicts or to be truly ambitious even though she's slightly manipulative, where else for her but Ravenclaw?
Hard work and loyalty, Junna are Banana are Hufflepuffs, for sure. Futaba, too, and same goes for Mahiru.
Just as Claudine's fiery will to fairly overtake Maya, Karen's recklessness would deposit her firmly in Griffindor.
And of course, their ambition and strive to be the top star would make Hikari and Maya fine members of Slytherin.
These, of course, just my interpretation. What about yours?