Dr. Stone, Vol. 27 (manga)

Imagine waking to a world where every last human has been mysteriously turned to stone…One fateful day, all of humanity turned to stone. Many millennia later, Taiju frees himself from the petrification and finds himself surrounded by statues. The situation looks grim—until he runs into his science-loving friend Senku! Together they plan to restart civilization with the power of science!Senku and pals are determined to build the ultimate scientific creation—a time machine! But one day, they receive an ominous message from the future.

This unexpected occurrence makes the time machine seem more possible than ever, but what’s the real reason behind the transmission?