Even though the detective organization "L" was already well known to everyone, one day, a scientist finally devoted his life's efforts to a study of evolving humans. Finally, a new human evolved. Due to the doctor's will, this new human inherited the 5th "L" when the 4th generation "L" was still in office. This was a new world of fighting. Fighting for dignity, he changed the whole world and created miracles one after another with a mechanic who called himself "X". L and X just arrived. . . . . .