EP9 ดร.สโตน เจ้าแห่งวิทยาศาสตร์กู้คืนอารยธรรมโลก Dr. Stone ดูการ์ตูนออนไลน์ | Kohaku's older sister, Ruri, is ill. Senku discovers this and tells Kohaku and Chrome that he will develop 'sulfonamide'. Senku begins various experiments in order to make different elements starting with iron. One of the villagers named Suika aids him in his experiments, but they are still short on hand. Senku uses a 'delicious scientific recipe' to make food to get the villagers to help them.