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