葉月志乃

A nurse that assists Takumi's doctor.

She is Grimm and also the serial killer behind most of the New-Gen cases.
She is a member of the cult detective Ban is investigating, known as the "Cosmic Church of the Divine Light". She kills herself by driving a stake used in the third New-Gen case into her throat./

Edited from url=http://en.wikipedia.org/wiki/Chaos;Head