Shakugan no Shana S: OVA Series

Find out what happens when Yuji accidentally triggers a found Treasure Tool while it's pointed at Shana! Then, Yuji teams up with Wilhelmina to stalk their fiery friend—whose secrecy has become unsettling. Finally, in a two-part special, Shana tracks a Denizen's trail by sorting through a Torch's memories for clues. Her sleuth skills reveal a teenage girl's heartwarming last days and a predator with a serious identity crisis!

(Source: FUNimation)