1girl aoi_(blue_archive) ball beachball bikini blue_archive blue_eyes blue_hair blue_halo blush book earclip giga-tera halo highres holding holding_book looking_to_the_side lying mole mole_under_eye navel on_back on_grass outdoors pointy_ears shoes short_hair side-tie_bikini_bottom solo swimsuit unworn_shoes white_bikini