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