1girl, animal_ears, ass, back, bare_shoulders, bikini, black_bikini, black_hair, blue_archive, cat_ears, cowboy_shot, extra_ears, frilled_bikini, frills, from_behind, gnns, halo, long_hair, looking_at_viewer, looking_back, official_alternate_costume, outdoors, red_eyes, serika_(blue_archive), serika_(swimsuit)_(blue_archive), solo, standing, swimsuit, thighs, twintails, very_long_hair