background animation, darling in the franxx, hair, kazutaka sugiyama, hiro (darling in the franxx), 1girl, zero two (darling in the franxx), pink hair, long hair, 1boy, black hair, bodysuit, horns, pilot suit, uniform, military, military uniform, oni horns, hetero, couple, red bodysuit, holding hands, red horns, bangs, standing on one leg, looking at another, white hairband, long sleeves, window