"Prevention" (阻止 Soshi?) is the 75th chapter of the Toaru Kagaku no Railgun manga series, released on March 27, 2015. October 4 arrives with two predictions meeting up on a single place. While Shirai Kuroko and Uiharu Kazari are doing their best to intercept these two incidents, Miyama Shaei's life is endangered when his ability begins taking a toll on his body.