"A Certain Scientific Accelerator" is a Japanese manga series set in the same universe as A Certain Magical Index. It follows the story of Accelerator, a powerful esper with the ability to manipulate vectors. The narrative focuses on his interactions with a young girl named Last Order and explores themes of redemption and the consequences of power. The series combines elements of action, science fiction, and drama, showcasing the challenges faced by its characters in a world filled with supernatural abilities. It highlights the complexities of espers and their relationships, contributing to the broader lore of the Toaru universe.