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, cloud, bikini, sky, topless male, ponytail, day, closed eyes, water, oni horns, hetero, couple, blue sky, hairband, red horns, white bikini, outdoors, partially submerged, open mouth