Amphitheater (アンフィシアター,Anfishiatā?) is a short story published in Dengeki Bunko Magazine to celebrate the 15th anniversary of the Shakugan no Shana light novel series. The story is set 2 years after the creation of Xanadu.
Amphitheater was the short story that was announced to be in the works during the anime series' 10th anniversary event on December 5, 2015. The colored illustration by Noizi Itō for Amphitheater was given out to people who attended the event as an illustration card.