1girl arm_up armpits backlighting bad_id bad_pixiv_id bare_arms bare_shoulders black_hair blue_eyes cloud collarbone dress gokou_ruri hand_on_headwear hat long_hair looking_at_viewer open_mouth ore_no_imouto_ga_konna_ni_kawaii_wake_ga_nai sky sleeveless sleeveless_dress solo sundress sunset takabow white_dress