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, topless male, long hair, swimsuit, cloud, sky, bikini, day, oni horns, ponytail, water, red horns, couple, hetero, blue sky, hairband, white hairband, partially submerged, looking at another, hand on another's arm, outdoors, cloudy sky, closed eyes, white bikini, male swimwear, open mouth