Ace

An executive of the Port Mafia, a man with narrow eyes in a tailcoat. Originally a gambler who wreaked havoc in the Mafia's gambling den, he paid a large sum of tribute to gain his current position. As a result, during the Great War of the Three Companies, he was the first to flee to the shelter, demonstrating minimal loyalty to the Mafia. Kouyou commented that he only considers the Mafia as security guards at most.

He planned a rebellion against the Port Mafia and, as part of his plan, tried to recruit Dostoyevsky. He captured Dostoyevsky and challenged him to a rigged High & Low game but ended up being defeated. He believed the cause of his defeat was being trapped in Dostoyevsky's consciousness by Dostoyevsky's special ability. To escape and return to the real world, he committed suicide. This act was based on information obtained from him and his collaborator who had captured him, making him think that it would bring him back to reality. However, in reality, it was false information spread by Dostoyevsky, leading him to truly take his own life.

Delusion of the Jewel King

A special ability which converts the lifespan of those who willingly wear A's collar (whom A treated like slaves and called "subordinates") into a jewel of equivalent value.