Hibiki

A cabaret club girl, she met Nobuto Matori a year ago and later became his girlfriend. She was working at a cabaret club in Chiba, but she is grateful to Nobuto for helping her make a connection with her current high-class cabaret club, and she forgives him for cheating on her, but she is still single-mindedly devoted to him. He is the one who knows Nobuto's secret, which even the organization does not grasp. Source: Fandom