Hilda Arc Edit
Katze was introduced in Volume 8, chapter 1 as the representative of Regiment Hex at the Bandire. She began arguing with the Vatican representative and personal nemesis, Meiya, regarding peace. When the time came to choose a side, she chose Greneda due to her hatred for Meiya. When the fighting started after the sides were chosen, Katze and Meiya fought each other until Kinichi Tohyama (Kana) put an end to it. After the "Seven Stars of the Golden Shell" was split into five pieces after being partially removed from Aria H. Kanzaki body, Katze took one and retreated into the mist.
Normal Life Arc Edit
Katze was briefly mentioned in Volume 12, Chapter 5 by Tamamo as having fought Meiya to a stalemate before retreating to her base in Berlin. Then, the Liberty Mason exorcists began searching for her, however, these battles in Europe were depleting the European Deen forces.