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, uniform, oni horns, red bodysuit, white hairband, military uniform, red horns, hairband, military, hetero, couple, holding hands, looking at another, bangs, sitting, window