Kenpachi Zaraki vs. Retsu Unohana

Retsu Unohana vs. Kenpachi Zaraki is a fight during the Quincy Blood War between the 11th Division Captain Kenpachi Zaraki and the 4th Division Captain, Retsu Unohana. The expressed purpose being to help Zaraki to become more powerful by finally teaching him the art of killing.

Prologue
After announcing his decision to the Central 46 of wanting to have two Lieutenants, Shunsui Kyōraku goes on to reveal his intention of having Retsu Unohana teach the 11th Division's Captain, Kenpachi Zaraki, how to fight. Giving them permission to use the prison's lowest level, Muken as a stage for their training, the two captains descend and find themselves in an infinitely wide, featureless floor. Exchanging words, both former and current Kenpachi draw their weapons in preparation before lunging at one another.