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