Ga-Rei-Zero is a tV series anime that premiered in fall 2008, produced by AIC Spirits.

About the production: the story comes from a manga, there are 12 episodes of about 23 minutes and its current status is "finished".

Its main genres are action, supernatural and thriller, with themes such as Urban Fantasy, Female Protagonist, Super Power and Gore.

On AniList, Ga-Rei-Zero has an average score of 73%, a good score, and appears on 48,803 users' lists.

An elite squadron trained to combat supernatural forces is called in to investigate reports of invisible monsters terrorizing Tokyo, but their mission is complicated by the interference of a rogue exorcist. When the mysterious female slaughters the overmatched attack force, her former comrades are ordered to lock down the crime scene—and forever silence their old friend. (Source: Crunchyroll) Note: This series is a prequel to the manga series, Ga-Rei.

Official synopsis from AniList.