A mysterious group called Humarize firmly believes in the Quirk Singularity Doomsday Theory, which states that when Quirks further merge with their offspring, this power will bring about the end of humanity. To save everyone, professional heroes around the world ask the UA Academy heroes in training to assist them and form a world-class hero selection team. In the most dangerous crisis yet to occur in My Hero Academia, it's up to the heroes to save the world and the future of heroes.