Yoshimori Minato

Ayaya's "friend" whom she met while Minato was being chased down by thugs and she decided to help her out. This was due to her addiction with drugs which she gained through her abusive ex-boyfriend; at first, she was just trying them to get experience, but got totally addicted to 'em. After having no money to pay for the drugs, she left her boyfriend and ran away from him, thus resulting in the thugs coming after her.

Spoiler

She's actually a Connector of a Coµ called "MacBeth".