Zange is another goddess and Nagi's twin sister. Opposite to Nagi who had her powers weakened due to her sacred tree being cut down, Zange's tree is still intact and located in a church's courtyard, thus she is still able to catch and cleanse impurities by herself. The fact that she switched her character to that of a Catholic nun, as it is a stronger religion, contributed to her divinity being intact. Despite seemingly being kind and caring on the outside, she usually takes advantage of Nagi's weakened state to torment her.
The word zange in Japanese means 'penitence' or 'confession.