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