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