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