1girl, ahoge, aqua_jacket, bad_pixiv_id, barefoot, beach_umbrella, bikini, blue_archive, blush, closed_eyes, eyewear_on_head, frilled_bikini, frills, hair_bobbles, hair_ornament, halo, hoshino_(blue_archive), hoshino_(swimsuit)_(blue_archive), hugging_object, inflatable_toy, inflatable_whale, jacket, long_hair, long_sleeves, low_twintails, lying, marudeningen, on_stomach, open_mouth, pink_hair, simple_background, solo, starfish, sunglasses, swimsuit, twintails, umbrella, white_bikini