A woman wearing strange armor who works for Nerval.
Spoiler beginning ep. 10:
Behind the iron outfit, she is actually the woman who Akiha met in the dream. Her name is Kagura. She was originally with Leopard and Honoka, but she is with Nerval after her disappearance long time ago because her mind was controlled. Later in the series, she regained her conscience and is back as Kagura.