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Y-City (Y市, Y Shi) is a large city on Earth. Child Emperor's Lab is located in this city.

There are 14 heroes living in this city.[1]


Child Emperor's LaboratoryEdit

A laboratory owned by Child Emperor is located in Y-City. He builds and experiments with various gadgets here. He is seen sitting on his movable chair.

Restaurant MammothEdit

A gourmet restaurant where Fubuki brought Saitama, Genos and King (it is unknown if Bang came too). It seems to have quite a large menu, which includes; Salads with dressing, sirloin, fillet and butter topping.



Number of Heroes by Class:[2]

  • A-Class: 1
  • B-Class: 3
  • C-Class: 10




Human Monster SagaEdit

Monster Raid ArcEdit

During the Monster Raid, Eyesight attacks Y-City. Pig God defeats her by devouring her whole.[3]

The following section contains Webcomic spoilers. You have been warned, manga-only readers.

Unnamed SagaEdit

Fall of the Hero Association ArcEdit

The Forest Tribe attempts to invade the city, only to be stopped by Genos.[4]

Appearances in Other Media Edit



Y-City is attacked by Jumping Spider, but he is quickly put down by Bang, Genos, and Saitama. They then go to 'Mammoth Restaurant' to have dinner.


  1. One-Punch Man Anime; Episode 14
  2. One-Punch Man Anime; Episode 14
  3. One-Punch Man Manga; Chapter 67
  4. Webomic Chapter 108


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