Master is a supporting character in the anime This Boy is a Professional Wizard. He is the owner or proprietor of the bar called Memento Mori, which is the favorite bar of Chiharu Kashima, the captain of the Wizard Bureau's Crisis Countermeasures Division. Master's establishment serves as a key social setting where the main characters interact outside of their professional lives. He is a regular presence in the background of the series, providing a familiar and welcoming environment for Chiharu and later for Toyohi Utsumi. As a barkeeper, Master is approachable and maintains a neutral, professional demeanor, allowing the patrons to unwind and connect. His role in the story is primarily that of a supportive background figure who facilitates the social space where the relationship between Chiharu and Toyohi develops. There is no detailed information available about his personal background, deeper motivations, personality traits beyond his role, character development over the course of the series, or any notable magical abilities. His key relationship is with Chiharu, as a familiar face at the bar he frequents. No further information about Master's past, inner conflicts, or growth is present in the available sources.