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