The Retired Hero of City-U

Non-canon Story of One Punch Man universe, a 21 year old woman named "Nancy" was a number 1 class S hero of the City-U. Retiring and trying to visit her Big Bro in the City-Z in his located apartment.

Nancy comes to visit Saitama once in a while when she found her big brother becoming bald and becoming insanely strong that he can one punch any foes.