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