You can read Bleach 524 at this online popular manga site. Here is the summary of Bleach chapter 524: Unohana has left a letter to her lieutenant Isane, while Zaraki leaves his eye patch for Yachiru to find. In the dark, isolated cave, Unohana and Zaraki start their battle with Unohana easily getting the better of Zaraki with her two sword style. Zaraki is slashed and beat up and Unohana tells him that he's weak.
Eventually Unohana disarms Zaraki and stabs him through the throat. Zaraki thinks he is done for, but moments later he is fighting Unohana again. Zaraki isn't sure what happened but decides to focus on the fight instead. Little does Zaraki know, Unohana's plan is for Zaraki to get stronger by sending him cross the boundary the death again and again, and this is a mistake on Zaraki's part and a sin on Unohana's part.
Eventually Unohana disarms Zaraki and stabs him through the throat. Zaraki thinks he is done for, but moments later he is fighting Unohana again. Zaraki isn't sure what happened but decides to focus on the fight instead. Little does Zaraki know, Unohana's plan is for Zaraki to get stronger by sending him cross the boundary the death again and again, and this is a mistake on Zaraki's part and a sin on Unohana's part.
