A 4 episode OVA series. Every episode will involve different side stories from the original source material. Episode 1 - Reshuffle: 
Due to the effect of Friagne's treasure device, the bodies of Shana and Yuji are swapped. They try to overcome the situation secretly, but... Episode 2 - Domicile: 
Recently, Shana has been acting strangely. Worried about her well-being, Yuji and Wilhelmina decide to follow her from the shadows after school one day. What secret could Shana be hiding? Episode 3 - Overture (Part 1): 
While hunting for a certain tomogara, Shana steals the existence of a torch named Oogami Junko in order to make her investigation throughout the city easier while also dealing with the family problems left behind by Junko when she was devoured. Episode 4 - Overture (Part 2): 
Continuation of episode 3.

Episode 1 - The End to Everything, the One Beginning

Episode 2 - The Lit Flame

Episode 3 - The Torch and The Flame Haze

Episode 4 - The Confused Flame Haze

Episode 5 - Respective Thoughts

Episode 6 - Complication. Activation. Confrontation

Episode 7 - The Two Flame Hazes

Episode 8 - The Beautiful Goblet

Episode 9 - The Poolside of Love and Desire

Episode 10 - Entangled Feelings

Episode 11 - Yuuji, Shana and a Kiss

Episode 12 - The Flower that Blooms in the Cradle

Episode 13 - Declaration of War Behind The School

Episode 14 - A Great Person

Episode 15 - The Day the Flame Was Born

Episode 16 - Slaying Hand of Shakugan

Episode 17 - A New Chapter

Episode 18 - Shattered Wish

Episode 19 - Within the Battle

Episode 20 - Heartless Wirhelmina

Episode 21 - Diverging Feelings

Episode 22 - The Flickering Flame

Episode 23 - Battle at the Palace of the Stars

Episode 24 - Crimson Thoughts

J.C.STAFF

NBCUniversal Entertainment Japan

Funimation

ASCII Media Works

Hakuhodo DY Music & Pictures

Shakugan no Shana S