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