1girl, |, blue_archive, blue_footwear, blue_one-piece_swimsuit, blush, closed_mouth, collarbone, demon_girl, demon_horns, demon_wings, feet, flat_chest, hair_tie, halo, hina_(blue_archive), hina_(swimsuit)_(blue_archive), horns, innertube, knees_up, long_hair, name_tag, official_alternate_costume, old_school_swimsuit, one-piece_swimsuit, one_side_up, purple_eyes, ryuinu, sandals, school_swimsuit, simple_background, sitting, solo, swimsuit, toes, very_long_hair, whistle, whistle_around_neck, white_background, white_hair, wings