akira hamaguchi, darling in the franxx, effects, liquid, 1girl, 1boy, hiro (darling in the franxx), zero two (darling in the franxx), long hair, black hair, pink hair, horns, oni horns, hetero, green eyes, swimsuit, anime coloring, couple, bangs, red horns, one-piece swimsuit, looking at another, water, hairband, white hairband, ponytail, collarbone