1girl, afloat, ahoge, arashiomoto, armpits, ball, beachball, blue_archive, collarbone, demon_girl, demon_horns, demon_wings, forehead, hair_ornament, hairclip, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, in_water, lifebuoy, long_hair, looking_at_viewer, lying, name_tag, ocean, official_alternate_costume, old_school_swimsuit, on_back, one_side_up, parted_bangs, purple_eyes, sandals, school_swimsuit, sidelocks, sleeveless, solo, swimsuit, white_hair, wings