Here's what happens directly after the Kurakara Town arc in the main storyline:
The Arrancar arc:
* Chapter 150: The manga immediately jumps back into the main plot, focusing on Ichigo and his friends' training with the Soul Society.
* Chapters 151-195: The story shifts to the Hueco Mundo arc, where Ichigo and his allies face off against the Arrancar, powerful Hollows with human-like powers. This arc features major battles and the introduction of several key characters like Ulquiorra Schiffer and Grimmjow Jaegerjaquez.
So, while the Kurakara Town arc doesn't have a direct sequel, it's followed by a significant arc that sets the stage for the main conflict of the series.
Important Note: The anime adaptation of Bleach added several filler arcs, some of which occur after the Kurakara Town arc. These arcs are not canon to the manga and are generally considered non-essential for the overall story.