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, anime coloring, swimsuit, oni horns, hetero, green eyes, couple, bangs, red horns, looking at another, hairband, water, one-piece swimsuit, collarbone, pool, ponytail, white hairband