1girl, blue_archive, blue_one-piece_swimsuit, blush, ddangbi, hair_ornament, hairclip, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, innertube, long_hair, looking_at_viewer, lying, old_school_swimsuit, on_back, one-piece_swimsuit, one_side_up, purple_eyes, purple_hair, sandals, school_swimsuit, solo, swimsuit, water, whistle, whistle_around_neck, wings