Color of undies:
Aria - pink
Shirayuki - black
Riko - honey gold
Reki - green
Therefore, Jeanne's pantsu will be silver/white colored?
As a LN reader, I see familiar faces in that locker room event.
Spoiler for LN:
I'm pretty sure that's a fundoshi I'm barely seeing there...
F--ma looks like a younger version of Sera from Kore Zombie.