Shakugan no Shana II (Second) EP8 - The Door to the Past

The episode starts off with Yuji being trained by Shana and Wilhelmina. Yuji managed to somehow defeat a Rinne that Wilhelmina summoned. In the background, Sato, one of Margery Daw's guides was silently observing, after which Sato returns and tried to plead with Margery Daw to be requested to be trained. However Margery Daw declines and subsequently tells Sato and Tanaka about her past. In her past, there appears a boy as a flame haze and the story subsequently plot around the boy and Margery Daw. The Boy is revealed to be named Yuri Chvojka.