A squad leader of the Port Mafia. Blunt and cold, he is the epitome of a 'cold city man.' Given that Higuchi fell for him, he is likely quite handsome. 20 years old

An executive of the Port Mafia. Though small, he is agile and possesses powerful martial arts skills. In terms of pure combat ability, he is top-tier within the Port Mafia. He favors black clothes and a black hat. 22 years old

A member of the Port Mafia's Black Lizard, holding the rank of Commander. He specializes in marksmanship and calls Higuchi Ichiyo 'Big Sis.' He has a somewhat arrogant way of speaking but is sincere when it counts. 19 years old

One of the five executives of the Port Mafia. She has an obsession and a form of love for Kyouka. Her speech and attire are traditional Japanese and elegant. 26 years old

Speaks briefly about what she wants. She is young and usually blunt. 142cm Her hair is braided on both sides. She wears a traditional Japanese kimono.

Akutagawa Ryunosuke's younger sister. A member of the Black Lizard. A silent character who wears a mask, she holds the rank of Commander under Hirotsu along with Tachihara. Her specialty is assassination. It appears she joined the Mafia with her brother Ryunosuke six years ago. Her appearance without the disguise is pure and innocent. She is more timid than expected, has a feminine voice, and rarely speaks.

Akutagawa Ryunosuke's junior. She tries to stay as close to Akutagawa Ryunosuke as possible using work as an excuse. As Akutagawa's subordinate and junior, she likes Akutagawa very, very, very much. She gets extremely happy when Akutagawa praises her and works hard to please him.