Senku and his friends all enrolled into U.A high school all attending the regular course and being overshadowed by the Hero course. However, this big scientist is not letting some heroes get in the way of his dream. He will prove once for all that science is more important than being a hero.

The light from the 1st quirk user was not supposed to be harmless nor being admitted from them at all. That light was supposed to be one that petrified the world rather than made superpowers real. Decades later, without warning original intended purpose of that light was unleashed upon the world. In that instant 80% of the world was petrified creating a stone world.

Man Kind isnt at the top anymore! Katsuki learns this and more as he and a much older Deku try to survive a world of Stone and try to use quirks and science to bring everyone back!