1girl, animal_ear_fluff, animal_ears, bikini, black_bikini, black_hair, blue_archive, cat_ears, fang, fish, fish_in_mouth, frilled_bikini, frills, halo, leaning_forward, long_hair, nekodama2000, official_alternate_costume, outdoors, red_eyes, saury, serika_(blue_archive), serika_(swimsuit)_(blue_archive), solo, swimsuit, twintails, wading, water