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, bodysuit, pilot suit, horns, uniform, oni horns, red bodysuit, holding hands, hetero, red horns, military, military uniform, closed eyes, white hairband, couple, hairband, window, bangs, looking at another