1girl 3_(sanyako1) absurdres animal_ears arknights bangs bikini blue_sky blush breasts brown_eyes brown_hair choker cleavage day extra_ears highres jacket large_breasts long_sleeves looking_at_viewer navel o-ring o-ring_choker official_alternate_costume open_clothes open_jacket outdoors parted_lips roberta_(arknights) roberta_(summer_flowers)_(arknights) seashell see-through shell shell_to_ear short_hair sky smile solo starfish swimsuit third-party_edit water wet wet_clothes white_bikini white_choker white_jacket