1girl, blue_hair, bra, breasts, cleavage, closed_mouth, green_eyes, grey_bra, hiroki_(yyqw7151), idolmaster, idolmaster_million_live!, looking_at_viewer, medium_breasts, nanao_yuriko, navel, plaid, plaid_bra, short_hair, smile, solo, underwear, undressing, upper_body