To Aru Kagaku no Railgun is a Japanese anime series based on the manga of the same name, a spin-off of the To Aru Majutsu no Index series. It follows the story of Mikoto Misaka, an electromaster and one of Academy City's most powerful espers, as she navigates her life in a city filled with superpowered students. The series blends science fiction and action, exploring themes of friendship and justice.