1girl, 3, afloat, ahoge, armpits, blue_archive, blurry, collarbone, demon_girl, demon_horns, demon_wings, depth_of_field, hair_ornament, hairclip, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, kaminose_(user_veum4325), lifebuoy, long_hair, looking_at_viewer, lying, name_tag, ocean, official_alternate_costume, old_school_swimsuit, on_back, one_side_up, purple_eyes, school_swimsuit, sidelocks, sleeveless, solo, swimsuit, whistle, whistle_around_neck, white_hair, wings