2girls, ahoge, animal_ears, barefoot, bikini, blue_archive, blush, closed_eyes, demon_horns, eyewear_on_head, feet, frilled_bikini, frills, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, hoshino_(blue_archive), hoshino_(swimsuit)_(blue_archive), inflatable_toy, inflatable_whale, innertube, long_hair, looking_at_another, low_twintails, low_wings, lying, multiple_girls, multiple_horns, name_tag, official_alternate_costume, old_school_swimsuit, on_stomach, one-piece_swimsuit, oozumi_03, open_mouth, pink_hair, pool, red_eyes, school_swimsuit, smile, soles, sparkle, sunglasses, swimsuit, toes, twintails, water, wet, whistle, whistle_around_neck, white_bikini, wings