Genno was a carpenter who came to Konoha to help a rebuilder in the rebulit plan. In the past, he fought Konohagakure with his homevillage Kagerougakure. When Kagerou was whiped out by an unknown hidden village, Genno was the only one left from his village. After that, he left to create an organization known as The Oyasumi and named himself One or Ichi to hide his identity.