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