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