1girl, aoki_kei, armpits, black_hair, black_sports_bra, breasts, clothes_lift, idolmaster, idolmaster_cinderella_girls, idolmaster_cinderella_girls_starlight_stage, low_ponytail, midriff, pants, selfie, sports_bra, sports_bra_lift, sweat, trainer_(idolmaster), underboob, ushimochi, wristband, yoga_pants