Acquaintance of Masaomi and Izaya.

Spoiler

Saki is a girl who has a godlike idolization of Orihara Izaya. She approaches Masaomi under Izaya's instructions and becomes Masaomi's girlfriend. Later Saki lets herself be abducted and injured by Blue Square under Izaya's instructions. Blue Square members Kadota, Yumasaki and Karisawa betray their gang and save Saki, who is immediately hospitalized. She remains hospitalized more than a year under Izaya's instructions. Then She discovers that her feelings for Kida were true after all.