Time Again
Yuji has been put to sleep by a Denizen as he encounters events from the past in a dream. When he realize he was only dreaming, the spell was broken. He awoke to see Shana destroying the Denizen, calling it "weak". However, it was not the true form.
Aired 05/10/2007EP 1 - Time Again
Shakugan no Shana: Season II
The heated bond between Shana and Yuji is tested as their paranormal adventures continues. The Flame Haze fends off supernatural foes by night. By day, she contends with a classmate who's also after Yuji's heart. Emotions flare as a suspicious transfer student who resembles a recently defeated Denizen clings to Yuji. His training rises in intensity when they catch wind of a revered warrior in search of her lost lover—who will stop at nothing to extract the power keeping Yuji alive!
(Source: FUNimation)