I have a friend that watches Shakugan no Shana and he wanted the opening song that plays for the second half of the season. I'll put the info that he gave me, I hope it will help in finding it.

Song name: Blaze
Artist: KOTOKO
Anime: Shakugan no Shana Second
Used for: opening theme (second half of season)

If any one here has it, I would be happy if you could upload it.

Thanks very much, my friend also thanks you.