Tomiyama Masako is a supporting character in the series. She is known primarily for her close relationship with Hidemasa Okamura, a senior apprentice at Otori Sushi, whom she later marries. In the final episode of the national convention, Masako and Hidemasa open the third Otori Sushi shop adjacent to their home, marking a personal and professional milestone. She also appears briefly in the sequel Mr. Sushi King 2 as an elderly woman, assisting Hidemasa with the third store. Her role in the story centers on her eventual marriage and involvement in the family sushi business, rather than on sushi-making ability or competitive ambition. Her motivations are family-oriented, and her presence provides a supportive, domestic anchor within the broader narrative of the sushi world. No further details about her background, personality, or development are available from reliable sources.