1girl, afloat, ahoge, armpits, blue_archive, blue_sky, blurry, cloud, cloudy_sky, collarbone, demon_girl, demon_horns, demon_wings, depth_of_field, forehead, hair_ornament, hairclip, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), holding, holding_whistle, horizon, horns, lifebuoy, long_hair, looking_at_viewer, lying, name_tag, ocean, official_alternate_costume, old_school_swimsuit, on_back, one_side_up, parted_bangs, patreon_username, purple_eyes, school_swimsuit, sidelocks, sky, sleeveless, solo, sonaworld, swimsuit, wavy_hair, whistle, whistle_around_neck, white_hair, wings