Which chapter of the manga does Season 4 of My Hero Academia anime start in? The trailer of Season 4 of the anime My Hero Academia has been released, and I'm assuming that by knowing in which chapter of the manga Season 3 of the anime ends, you can know which chapter of the manga Season 4 starts. 

Which chapter of the manga does Season 4 of My Hero Academia anime start?
According to Mangaupdates and the wikia, Boku no Hero Academia adapted up to Chapter 124 in Season 3. Therefore, Season 4 is expected to adapt the chapters after that, starting in Chapter 125.