Rei sits silently in her school swimsuit, indifferent to the excited voices.
Girl:“(Ad-lib)”
Reichu: Originally, Rei was supposed to be sitting in her school uniform. Also, when the storyboard was done, the final girls' uniform design hadn't been decided. Here's the econte for C-114, just because you get a clearer look than in 106.
NemZ: Hmm, that's interesting. Might suggest she's she was intended to still be slightly injured and thus excused from participation.