Hishoku no Sora by Mami Kawada
Here’s the complete version of the song for the first opening of Shakugan no Shana for those who were interested. As you can tell from the title of the post, it’s called “Hishoku no Sora” and Mami Kawada provides the vocals. I happen to have several other songs by her that maybe I’ll stream at some other time. For now though, here’s “Hishoku no Sora”.