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