Shakugan no Shana S

Reshuffle — While searching through the Hunter's nest for a particular treasure, Shana and Yuuji encounter some unforeseen difficulty when they discover a Hougu named Reshuffle, that swaps their minds.

And to make things even more complicated they cannot let anyone know that this body transfer happened.

Domicile — Shana seems to be coming home late ever so often, keeping something secret from Wilhelmina Carmel. The 'overprotective mother' in Carmel is very upset about this development, and tries to find out what Shana is hiding, recruiting Yuuji for the task.

Overture Part One & Two — Shana tracks down and extinguishes the life of a female Torch, Oogami Junko, that was fed on by a Tomogara (beings trying to steal the Power of Existence from mortals). In Shana's investigation to track down the Tomogara, she assumes the life of Junko, backtracking the Torch's last few days.

— written by foo2

Note: Each episode presents a different side story from the novels.