The Final Getsuga Tensho!? Ichigo's Training!

In the Precipice World, Isshin describes to Ichigo that time in the Precipice World is reduced to the point that if one were to stay in that world for 2000 hours (3 months), only one hour will have passed in the outside world, making it ideal for training purposes now that The Cleaner has been destroyed. Isshin devises a method for Ichigo to learn the Final Getsuga Tensho in 2000 hours in that world. To do that, Ichigo must directly contact his zanpakuto. Once entering his inner world, he meets the spirit of his bankai, Tensa Zangetsu, who refuses to co-operate with him, and pulls out the "source of his despair" which turns out to be Ichigo's inner hollow. Meanwhile, in the real Karakura, Keigo and Arisawa both wake up and wander through the town, pondering what has happened to them. Aizen and Gin confront both of them, paralyzing them with their reiatsu.