1girl, ball, bare_arms, bare_shoulders, beach, beachball, bikini, blush, brown_eyes, brown_hair, day, forehead, from_behind, karakai_jouzu_no_takagi-san, long_hair, looking_at_viewer, looking_back, nose_blush, note2000, outdoors, parted_bangs, red_bikini, sand, side-tie_bikini_bottom, solo, squatting, swimsuit, takagi-san, water