What kind of title is this?: Manga.
How many volumes are there?: 21 volumes are listed.
How many chapters are there?: 180 chapters are listed.
Where can I read it?: Reading links are listed for Seven Seas Entertainment, Official Site. Check availability in your region.

Synopsis

About A Certain Scientific Railgun

Welcome to a world where mysticism and science collide, and supernatural powers are derived from either science or religion. At the heart of this world is Academy City, an advanced metropolis whose population is comprised mostly of students The majority of students are enrolled in the city's "Power Curriculum Program," where they must learn to master their latent psychic powers. Out of several million students, only seven are deemed powerful enough to have Level 5 status. Meet Mikoto Misaka, the third most powerful Level 5 esper in Academy City. Together with her best friends Kuroko Shirai and the other members of Judgment, a student-run law enforcement agency, Mikoto delves deep into the dark heart of the scientific sprawl she calls home, and uncovers secrets she wishes she hadn't! (Source: Seven Seas Entertainment) Note: Includes 10 extra chapters.

Action Comedy Sci-Fi