Episode guide:

Below you will find details of each episode, including the plot,links,trivia,etc.

Episode 1: The End of Everything, One Beginning
Episode 2: Burning Flame
Episode 3: Torch and Flame Haze
Episode 4: Flame Haze of Illusion
Episode 5: Respective Thoughts
Episode 6: Complication.Motion.Confrontation
Episode 7: Two Flame Hazes
Episode 8: Beloved Goblet
Episode 9: Poolside of Love and Ambition
Episode 10: Intertwining Feelings
Episode 11: Yuuji, Shana and a Kiss
Episode 12: A Flower Blooms in the Cradle
Episode 13: Declaration of War at the Back of the School Building
Episode 14: A Great Person
Episode 15: The Day the Flame was Born
Episode 16: The Flame-Haired Red-Hot-Eyed Hunter
Episode 17: A New Beginning
Episode 18: Shattered Wish
Episode 19: In the Midst of Battle
Episode 20: Heartless Wilhelmina
Episode 21: Fading Thoughts
Episode 22: Flickering Flame
Episode 23: Battle in the Seirei-den
Episode 24: Crimson Thoughts

The OVA:

The OVA has be scheduled to be released on the 8th December, titled "Shakugan no Shana Special: Koi to Onsen no Kougai Gakushuu!"(Love and Hot Spring Off-Campus Study Session!). *Official Site*

Synopsis:

The new OVA takes place directly after the events of the 13-episode TV series in a battle between Shana and her rival Kazumi Yoshida over Yuji. Meanwhile, everyone's favorite student Oga-chan has a thing for her classmate Eita Tanaka but discovers that he may be occupied with another friend and classmate. Refusing to lose to a man, Oga attacks! Taken from CDjapan