1girl, ahoge, black_background, black_bra, black_panties, bra, breasts, brown_eyes, brown_hair, hiroki_(yyqw7151), idolmaster, idolmaster_shiny_colors, kuwayama_chiyuki, long_hair, looking_at_viewer, medium_breasts, navel, panties, simple_background, smile, solo, underwear, underwear_only