3girls ahoge aircraft alstroemeria_(idolmaster) backless_dress backless_outfit black_dress black_suit bracelet breasts building computer crossdressing dress drone dutch_angle floating_hair formal glint headset helicopter holster idolmaster idolmaster_shiny_colors jewelry kuwayama_chiyuki laptop large_breasts long_hair looking_at_viewer looking_back multiple_girls night night_sky official_art osaki_amana osaki_tenka outdoors side_slit sitting sky smile suit thigh_holster very_long_hair