1girl, arm_up, baba_arumi, bad_twitter_id, bed, bed_sheet, braid, breasts, brown_hair, competition_swimsuit, covered_navel, highleg, idolmaster, idolmaster_cinderella_girls, idolmaster_cinderella_girls_starlight_stage, lying, on_back, one-piece_swimsuit, shimamura_uzuki, sideboob, swimsuit, white_one-piece_swimsuit