St. Germain Arc

The St. Germain Arc is a story arc in Shinyaku Toaru Majutsu no Index, covered in Shinyaku Toaru Majutsu no Index Volume 12. It involves an incident at the Dianoid on December 1st, where the entity known as St. Germain sealed off the building from the rest of the city. Among those who are trapped inside and faced with St. Germain's schemes include Kamijou Touma, together with Index and Othinus, ITEM and a boy posing as the Number Six Level 5, Aihana Etsu. Around the same time, the true Gremlin, having lost their Hidden World, begins to make their move.