: A large portion of the city has been completely abandoned by its inhabitants. While basic utilities like water and power still function, almost no one lives there because it is deemed unsafe by the Hero Association.
: The Hero Association investigates the area to find the source of the high monster density, unaware that the reason most "disasters" end quickly is simply because Saitama defeats them before they can leave the area. Key Events in Episode 6 6 : The Terrifying City
This leads the Hero Association to talk about the ghost town sector of City Z, which happens to be the same city Saitama lives in. Cain S. Latrani : A large portion of the city has
: The ninja villain makes another appearance, continuing his obsession with challenging Saitama to a rematch. One Punch Man Recap: Episode 6 “The Terrifying City” Key Events in Episode 6 This leads the
: Having recently registered as a professional hero, Saitama realizes he has done nothing "heroic" in five days. If he does not perform a heroic act within a week, he risks being dropped from the Hero Registry.
In the series, City Z has a notorious reputation for being a "haunted" or "terrifying" place due to its unusually high frequency of monster sightings and strange occurrences.
: A powerful monster known as Kombu Infinity arrives in City Z, drawn by rumors that strong monsters gather there. After easily defeating two Class A heroes (Golden Ball and Spring Mustachio), the monster encounters Saitama.