1girl, animal_ears, bikini, blue_archive, cat_ears, cowboy_shot, extra_ears, eyes_visible_through_hair, frilled_bikini, frills, grass, long_hair, miniskirt, navel, official_alternate_costume, outdoors, pool, serika_(blue_archive), serika_(swimsuit)_(blue_archive), sixten, skirt, smile, solo, stomach, swimsuit, tree, twintails, very_long_hair