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