akira hamaguchi, darling in the franxx, effects, liquid, 1girl, hiro (darling in the franxx), 1boy, pink hair, zero two (darling in the franxx), black hair, topless male, horns, cloud, long hair, sky, day, partially submerged, water, swimsuit, outdoors, one-piece swimsuit, tree, anime coloring, ponytail, blue sky, oni horns, cloudy sky, red horns, rock, couple, from behind