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Artist's commentary
こだまコス
木霊火煉：鏡宇宙の赤いユニフォームコス
Her classmates asking her to wear the Mirror Starfleet uniform from TOS S2 ep. 04 "Mirror, Mirror" for Natsukomi
(actually understandable if this ends up mistaken as an Uhura cosplay coz she did wear that in the ep)