1girl, animal_ear_fluff, animal_ears, bare_shoulders, bikini, bikini_skirt, black_bikini, black_hair, blue_archive, cat_ears, collarbone, feet, frilled_bikini, frills, halo, halterneck, hands_on_own_knees, legs, long_hair, looking_at_viewer, nail_polish, navel, official_alternate_costume, open_mouth, pink_eyes, sandals, serika_(blue_archive), serika_(swimsuit)_(blue_archive), simple_background, solo, squatting, stomach, swimsuit, toenail_polish, toenails, toes, twintails, v-shaped_eyebrows, very_long_hair, yakumo_crack