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