darling in the franxx, hair, smears, tomoyo kamoi, 1girl, 1boy, hiro (darling in the franxx), pink hair, zero two (darling in the franxx), long hair, black hair, couple, tree, hetero, from behind, nature, forest, clothed male nude female, nude, military, military uniform, horns, ass, uniform, oni horns, completely nude, outdoors, holding hands, red horns