1girl arona_(blue_archive) ass barefoot bikini black_bikini blue_archive blue_eyes blue_hair blue_sky blush chair closed_mouth cloud cloudy_sky desk feet flat_chest foot_focus foreshortening full_body hair_over_one_eye halo headband hinosaki legs looking_at_viewer medium_hair on_desk sitting sitting_on_desk sky smile soles solo swimsuit table thighs toes