Samejima Kuroe

Kuroe was a reserve student at Mihama Academy's CIRS division, also known as the "Phantom Triggers" back in the day. She also acted as Enishi's personal bodyguard and secretary. While she is a Hollow graduate from the same dangerous generation as Aoi, the clever and quiet Kuroe is classified as a "downer" type.
She's extremely loyal to her master Enishi, and doesn't have much interest in anything else.