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