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