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, black hair, long hair, horns, swimsuit, closed eyes, cloud, sky, day, ponytail, oni horns, water, white hairband, hairband, hetero, couple, blue sky, red horns, male swimwear, anime coloring, cloudy sky, one-piece swimsuit, hand on another's shoulder, bikini, alternate hairstyle, outdoors, partially submerged