1girl absurdres ass back back_focus backless_dress backless_outfit bare_back black_dress butt_crack commentary dress facing_away from_behind head_out_of_frame highres long_hair nijisanji nijisanji_en pupi_(rain_prophet) red_background reimu_endou solo sweat symbol-only_commentary twintails very_long_hair virtual_youtuber white_hair wide_sleeves