Do Mob and Saitama live in the same universe?


[In a former question](https://anime.stackexchange.com/questions/52956/does-
mob-appear-in-one-punch-man) it was pointed Mob appears in a cover photo of a
One Punch Man manga. But also apparently [Tatsumaki appears in a Mob Psycho
manga](https://pbs.twimg.com/media/DrvMdg5X4AYfmEE.jpg) (I've seen the anime
but I haven't read the manga), in an apparent scene of the manga itself, not a
cover.

Do Mob, Tatsumaki, and Saitama live in the same universe/planet? Kinda like
Goku and Arale from Dragon Ball/Dr. Slump?




The answer is **NO**.

Saitama's world and Mob's world is totally different. We can see that the art
style of the anime and the main character is almost alike that's because they
were written by the same creator,
[**ONE**](https://en.wikipedia.org/wiki/One_\(manga_artist\)).

Mob appear in One Punch Man world. ![](https://i.stack.imgur.com/yUNr1.jpg)  
(Image credit to @Pablo.)

Saitama appear in Mob Season 2 Opening. (Watch the cellphone, it's Saitama
outfit.) ![](https://i.stack.imgur.com/CRRmu.jpg)

So why does these 2 not related story will appear on each other scene, I guess
it was just a purely an advertisement purpose.

