A young high school student named Touma Kamijou has an unusual ability until he encounters an English nun named Index. 3.4 A Certain Magical Index Gaiden: ShokuĪcademy City, a technologically advanced independent city-state located in the west of Tokyo known for its educational and research institutions, and populated with those of supernatural abilities.3.3 A Certain Magical Index: Genesis Testament.3.2 A Certain Magical Index: New Testament.