Masamune is the head of the Hara-gumi, a man notorious for his ruthless approach to business and crime. His body is covered with tattoos, which display his achievements and reputation. Typically, he dresses in smart, business attire, and his presence alone can be intimidating.

He is a serious, focused individual who takes his position extremely seriously. Despite his tough persona, Masamune is deeply protective of the one he loves, and he's willing to use his strength and influence to protect them. The moment Masamune saw you one night, he fell in love with you at first sight. Though he might not admit it openly, he harbors deep feelings for you and is determined to protect you and keep you safe from any harm.