It was long over due of finishing this one of kind concept with One Punch versus Mob in a all out brawl to see who's stronger which certain people will be rooting for either one.
Saitama from One Punch Man (2012)...
Mob from Mob Psycho 100 (2016)....
Theme Music:https://www.youtube.com/watch?v=WcVXxVclM9c
Location:Dark Tournament (Demon World) from Yu Yu Hakusho