1girl, arm_support, asanezumi, ass, beach, blue_archive, blue_one-piece_swimsuit, blurry, breasts, collarbone, demon_girl, demon_horns, demon_wings, depth_of_field, hair_ornament, hairclip, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, leaning_back, lifebuoy, name_tag, ocean, official_alternate_costume, old_school_swimsuit, one-piece_swimsuit, outdoors, purple_eyes, school_swimsuit, sitting, small_breasts, solo, sunlight, swimsuit, whistle, whistle_around_neck, white_hair, wings