Uyamau (敬う, "bow") is a group of Souls who were experimented upon by the 12th Division thousands of years ago, in attempt to counteract a sudden influx of Vasto Lorde in Hueco Mundo by creating "super-warriors". Seven of these souls survived the experiments, but proved to be highly mentally unstable, being sealed away and deemed a failed experiment. Recently, they were set free through actions caused by a mysterious man who names himself Mado. Providing them with a drug to suppress their mental problems, they now serve him in a mission only Mado knows of.