background animation, darling in the franxx, hair, kazutaka sugiyama, hiro (darling in the franxx), 1girl, zero two (darling in the franxx), 1boy, pink hair, long hair, black hair, pilot suit, bodysuit, horns, red bodysuit, uniform, hetero, white hairband, hairband, oni horns, couple, red horns, military, military uniform, sitting, holding hands, bangs, window, long sleeves, closed eyes, looking at another