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