1girl, ahoge, armpits, arms_behind_head, arms_up, b1ack_illust, black_pants, blonde_hair, blush, breasts, cleavage, closed_mouth, collarbone, cowboy_shot, grey_sports_bra, hair_between_eyes, hair_flaps, ibuki_tsubasa, idolmaster, idolmaster_million_live!, large_breasts, looking_at_viewer, navel, pants, red_eyes, short_hair, sideboob, solo, sports_bra, sportswear, stomach, stretching, sweat, underwear, white_background