Dr. Stone. Volume 4 - Dr. STONE_x000D__x000D_ Riichiro Inagaki (author), Boichi (artist)_x000D__x000D_ _x000D__x000D_ Graphic ed_x000D__x000D_ _x000D__x000D_ Paperback_x000D__x000D_ _x000D__x000D_ Publisher's Synopsis_x000D__x000D_ Imagine waking to a world where every last human has been mysteriously turned to stone..._x000D__x000D_ _x000D__x000D_ 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!_x000D__x000D_ _x000D__x000D_ Senku and friends make their way through the scientific road map that'll lead them to the Ruri's cure! Next up, a death-defying quest to obtain one of the deadliest substances on Earth-sulfuric acid! Meanwhile, the Grand Bout Martial Arts Tournament approaches, and the prize is a big one-the chief's throne!