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