Shakugan No Shana Temporada 1 Episódio 14

Back before Shana became a Flame Haze, she was living in a large castle-like structure floating in the sky along with Alastor and a maid who cares for her. One day, a Denizen attacks the maid, whose name is Wilhelmina Carmel, who also happens to be a Flame Haze.