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