Yoshihiro Kurosaki is Kazutaka Hyōdō's new right-hand man within the Teiai Group, promoted after Yukio Tonegawa's dismissal. He manages the underground forced labor camp housing debtors like Kaiji Itō and supervises subordinates including casino manager Seiya Ichijō. Kurosaki maintains a calm, reasonable, and cautious demeanor, emphasizing operational fairness. He enforced the rules of a rigged Underground Cee-lo game, compelling foreman Tarō Ōtsuki to honor his bet against Kaiji's group despite Otsuki's reluctance, believing individuals must take responsibility for their actions. This principle led him to avoid premature intervention in the gambling match. Unlike Tonegawa, Kurosaki lacks a superiority complex, criticizing overconfidence as foolish. While acknowledging Kaiji's gambling skill, he deems his reliance on high-stakes games reckless for repaying debts.

In *Chūkan Kanriroku Tonegawa*, Kurosaki interacts more freely with Hyōdō, calmly contradicting him without repercussions, contrasting Tonegawa's fearful compliance. He demonstrates a harsh side, physically striking Hyōdō’s body double and defeating Tonegawa in Mahjong multiple times. Later, as head of the manhunt division pursuing Kaiji after the One Poker incident, Kurosaki orders Yūji Endō to recover stolen money. When Hyōdō commands Endō to commit suicide, Kurosaki intervenes, pragmatically arguing that a nearby suicide could negatively impact Hyōdō’s comatose son Kazuya, sparing Endō. Kurosaki's background includes years of service at Teiai, leading to his promotion to second-in-command. He closely monitors Kaiji’s activities, cautioning Ichijō against underestimating him during the Pachinko "Bog" challenge.