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, Chrome and Magma go spelunking for a rare mineral, but can they survive the dangers of a real-life treasure dungeon and make it back alive? They have no choice if they want to create the greatest "weapon" of modern times--the cell phone!