akira hamaguchi, darling in the franxx, effects, liquid, 1girl, hiro (darling in the franxx), zero two (darling in the franxx), 1boy, pink hair, swimsuit, one-piece swimsuit, long hair, black hair, horns, cloud, sky, hetero, topless male, ponytail, competition swimsuit, water, day, looking at another, couple, partially submerged, hug, blue sky, oni horns, outdoors, cloudy sky, breasts, face-to-face