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