Superb Song of the Valkyries: Symphogear

Season 2, Episode 6

Episode Title: A Miracle Is a Cruel Thing

Air Date: 2013-08-08

Overview:

After being seriously injured by the Nephilim, Hibiki is unable to control her Symphogear. She flies into a rage, destroying the Nephilim and ripping out its heart. During the post-fight medical exam, it's discovered that if she continues to use her gear, she'll die.