kojima chika, nagumo hajime, arifureta shokugyou de sekai saikyou, official art, 1boy, anime coloring, back, black boots, black coat, boots, coat, from behind, full body, grey hair, gun, hair between eyes, holding, holding gun, holding weapon, long coat, looking at viewer, looking back, mechanical arms, profile, prosthesis, prosthetic arm, prosthetic hand, red eyes, rifle, simple background, single mechanical arm, smile, solo, standing, transparent background, weapon