Gin Akutagawa is a member of the Port Mafia and is the assassin in the sub-group called Black Lizard. Her teammates in the group are Hirotsu, an older mentor-type man, and Gin's boyfriend Michizou Tachihara. Gin's older brother Ryuunosuke is very protective of her. Tachihara betrayed the Port Mafia, secretly having been spying for the military group called the Hunting Dogs. Gin is very quiet and shy, but she's strong and incredibly talented with a blade.