background animation, darling in the franxx, hair, kazutaka sugiyama, 1girl, 1boy, zero two (darling in the franxx), hiro (darling in the franxx), long hair, black hair, pink hair, military uniform, uniform, military, hetero, couple, from behind, red bodysuit, blood, horns, red horns, pilot suit, oni horns, red gloves, dark, bodysuit