Certain Scientific Railgun Vol. 20

A new academic year begins at Tokiwadai Middle School, bringing in fresh faces! But just as they dust off their books, a spate of incidents involving abilities occurs in Academy City, and the entire student body falls under suspicion. Meanwhile, Shirai Kuroko, a member of Judgment and a new student at Tokiwadai, begins investigating the incidents, only to find a mysterious message left on an office computer...