Kohaku’s sister, village priestess Ruri, is gravely ill. Senku, Chrome and Kohaku begin their quest to make antibiotics to save her life.
ever since it was discovered 
in the early twentieth century.
.مذ تمّ اكتشافه في أوائل القرن العشرين
ha salvato la vita a svariate 
centinaia di milioni di persone.
desde que foi descoberta 
no começo do século XIX.
он спас сотни тысяч жизней.