You can read manga Bleach 520 at this online popular manga site. Here is the summary of Bleach chapter 520: After messing around at Kirinji's healing spa, Ichigo and Renji are deemed good enough to leave after they survive being punched by Kirinji. Kirinji and his two subordinates are impressed by Ichigo and friends' ability to withstand the spring, and Kirinji even hurt his own hand punching Ichigo. Renji and Ichigo are then launched to the next palace.
Meanwhile, Kyoraku has been appointed the new Captain Commander of the Gotei 13. Kyoraku meets with the Central 46 to lay out his terms. Kyoraku's first request of having two vice captains is granted with small complaints, but then Kyoraku rattles a few feathers by stating that he'll have Kenpachi Zaraki learn the art of killing. The Central 46 fear that Kenpachi will become too powerful to contain and even Yamamoto dared to only teach Zaraki kendo for one day, but the Central 46 doesn't have a better solution to fight off another invasion. With the consent, Kyoraku hands the task of teaching Zaraki to the first Kenpachi Unohana Yachiru.
