Shakugan no Shana S

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.