The first volume of the Toaru Kagaku no Railgun manga series covers chapters 1 to 7, which spans from July 16 to 19 in the main storyline. Misaka Mikoto, one of the seven strongest espers in Academy City, reveals a side that only her close friends could see — that she is a friendly girl who often tries her best to help others. After meeting two new friends, she joins an investigation of a string of cases of bombings that occurred in Academy City's District 7.