Saiki's friends had found out about his powers and one day he... Accidentally teleported them to another timeline, no biggie he will just teleport them back... Except he can't...so now Saiki, Kaido, Nendo, Aren, and Teruhashi where stuck in a different timeline and they looked around and holy shit there are bounty posters for people, saying dead or alive... That's from like the ripe pirate era...