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