Professor Akane Tsumura is an unhired Professor specializing with Dueling History. She is the aunt of Reika Tsumura, the younger sister of Satoshi Tsumura and the sister-in-law of Nefertari Massri and Amon Massri. Akane had her degree for two months when her sister-in-law passed away and Satoshi asked if she could live with them duel to his work. A year later, Akane became the legal guardian (alongside her brother-in-law Amon) of Reika. Akane would have looked for a job, but her job to her niece was more important to her.

She is also the current CEO of Massri Corporation.