1girl, ahoge, bare_arms, beach, black_wings, blue_archive, blue_one-piece_swimsuit, closed_mouth, day, deca_purio, demon_wings, feet_out_of_frame, from_above, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, innertube, long_hair, looking_at_viewer, low_wings, lying, ocean, official_alternate_costume, old_school_swimsuit, on_side, one-piece_swimsuit, one_side_up, outdoors, parted_bangs, purple_eyes, school_swimsuit, shore, solo, swimsuit, thighs, water, wet, whistle, whistle_around_neck, white_hair, wings