akira hamaguchi, darling in the franxx, effects, liquid, 1girl, hiro (darling in the franxx), 1boy, pink hair, black hair, zero two (darling in the franxx), topless male, cloud, long hair, sky, day, water, partially submerged, swimsuit, outdoors, horns, one-piece swimsuit, tree, blue sky, twintails, couple, cloudy sky, anime coloring, oni horns, red horns, from behind