darker than black, yin, kaname nagi, 1girl, ass, ball, beachball, bikini, blush, choker, cloud, dutch angle, female, frilled swimsuit, frills, from behind, grey hair, hair ornament, hair ribbon, in profile, lens flare, long hair, ocean, ponytail, purple eyes, ribbon, silver hair, sky, solo, swimsuit, thigh gap, tied hair, violet eyes, wading, water