akira hamaguchi, darling in the franxx, effects, liquid, 1girl, hiro (darling in the franxx), zero two (darling in the franxx), 1boy, pink hair, black hair, horns, long hair, swimsuit, topless male, sky, cloud, oni horns, water, hetero, red horns, ponytail, couple, bikini, day, blue sky, open clothes, hairband, splashing, cloudy sky, white hairband, anime coloring, open mouth, partially submerged, ocean, blue eyes, outdoors, alternate hairstyle