akira hamaguchi, darling in the franxx, effects, liquid, 1girl, hiro (darling in the franxx), 1boy, zero two (darling in the franxx), pink hair, topless male, horns, black hair, long hair, swimsuit, cloud, sky, ponytail, hetero, couple, oni horns, day, bikini, water, closed eyes, red horns, blue sky, partially submerged, hand on another's shoulder, cloudy sky, looking at another, outdoors, alternate hairstyle, male swimwear, anime coloring