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