1girl, 777nasu, bare_shoulders, black_hair, breasts, dog_tags, grey_panties, grey_sports_bra, hair_down, idolmaster, idolmaster_shiny_colors, knee_up, large_breasts, long_hair, looking_at_viewer, navel, panties, shirase_sakuya, sitting, solo, sports_bra, stomach, two-tone_sports_bra, underwear, underwear_only, yellow_eyes