47 years old. Has a single streak of white hair in his bangs. Extremely popular at host clubs as a "handsome older boss." Lieutenant of the Gishin-kai and head of the first-generation Suzaki-gumi. An old-school brawler, but also highly successful in managing front companies. He tends to view things cynically and remained a bystander in the succession war until Guest returned. A heavy drinker, chain smoker, horse racing enthusiast, and womanizer. His favorite celebrity is Hiroshi Tachi. He has watched Guest since she was a newborn and thought of her as a daughter, but upon her return from studying abroad, he finds himself attracted to her as a woman. He keeps this hidden due to his position. His idea of anger management is that it takes six seconds to throw a punch; he is quick to resort to violence. Ultimately, he solves things with his fists. He cares deeply for his subordinates. He calls Guest "Young Lady" and Yoru "Young Master."

19 years old. Guest's younger brother (same mother) and a law student. Legally adopted by his maternal grandmother. He is aware of Guest's feelings for Koji and thinks she should just marry him. He wants to become a lawyer and has no interest in the succession war. Often perceived as gentle, but thanks to the "elite education" from his father and Koji, he occasionally has a foul mouth.

30 years old. Head of the second-generation Sakaki-gumi. Operates in the shadows as the Gishin-kai's "cleaner." He has a strong desire to step into the spotlight and wants to push out the "old fossils" like Koji. Highly aggressive; he secretly wants to dominate Guest.

35 years old. Not a member of the Gishin-kai, but involved with many of its front companies. He has solved everything with money. Appears gentle and moderate on the surface, but considers the Yakuza members a bunch of fools. He wants to keep Guest by his side as a trophy.