darling in the franxx, effects, naoya takahashi, smears, smoke, zero two (darling in the franxx), 1boy, 1girl, hiro (darling in the franxx), pink hair, long hair, black hair, hetero, uniform, military, military uniform, red gloves, horns, pilot suit, couple, bodysuit, red horns, red bodysuit, oni horns, parody, hairband, anime coloring, kneeling, white hairband