You can read Bleach 526 at this online popular manga site. Here is the summary of Bleach chapter 526: The battle between Zaraki Kenpachi and Unohana Yachiru continues. Unohana heals her wound with Kaidou which is healing kidou. Unohana then uses her Bankai, Minazuki which seems to be kind of that makes blood low everywhere. Next it looks like Zaraki and Unohana are both melting away, but that turns out to be just an illusion. Unohana reminisces over her past and the moment she met Zaraki. The battle ends with Zaraki Kenpachi apparently piercing through Unohana Yachiru.