Bleach: Season 11, Episode 6
Betrayal! Aizen's Secret Maneuvers (2 Jul. 2011)
At Squad Nine's camp, Shinji Hirako and the others run into Kensei Muguruma, who is donning a strange mask. Kensei starts to attack them, and he is too powerful to stop even with all of them combined.
Writer:Jessica Renslow (translation)