The first mobs in all countries in the world were made up of veterans. Because Hiroshima was bombed by atomic bombs, Hiroshima people were particularly sad and angry. As a result, a group of Hiroshima veterans, who couldn't get out of the shadow of war, bought several motorcycles, shaved their heads and found several sets of uniforms for special pilots of Kamikaze special attack teams, thus forming the first Japanese underworld who "rode bicycles with the mountain city and took pleasure in pranks".