Mabayu Aki is the main protagonist of Puella Magi Madoka Magica's prequel story Scene 0. After becoming aware of Homura Akemi's time stop, Mabayu seeks out the source of it; and upon understanding Homura's situation, resolves to team up with her to save Madoka Kaname from her fate.
She is voiced by Saori Hayami in the story.