darling in the franxx, effects, naoya takahashi, smears, smoke, hiro (darling in the franxx), 1girl, zero two (darling in the franxx), 1boy, pink hair, black hair, pilot suit, long hair, bodysuit, uniform, red bodysuit, horns, military, military uniform, hetero, looking at another, oni horns, anime coloring, red horns, bangs, kabedon