Oga Tatsumi is a first year student in Ishiyama High, a notorious school for delinquents. One day he sees a man floating by, and the man suddenly splits in half to reveal a baby boy inside!.

Cinco meninas do ensino médio se tornam amigas através do Light Music Club. Yui, a guitarrista principal, Tsumugi é a tecladista, Mio a baixista, Azusa é a guitarrista rítmica e Ritsu, a baterista.

In Toaru Kagaku no Railgun T Mikoto Misaka and her friends prepare for the Daihasei Festival, a seven-day sports competition between different Esper schools, which, of course, also include the Tokiwadai middle school.

A boy whose friend died and became a ghost, starts high school. On his first day, a trunk is sent to him by his brother. From that moment on everyone are after him believing that he holds the mysterious powerful "Asura Machine".