Yes, if you trigger the rival marriage event (which can only occur in Year 4 and after) Popuri will leave with Kai until he comes back in the Summer every year onward.
But Popuri and Kai have to be married in order for Karen and Rick to get married, right? So if you want Karen and Rick to get married, Popuri has to move away.
Feathertail wrote:But Popuri and Kai have to be married in order for Karen and Rick to get married, right? So if you want Karen and Rick to get married, Popuri has to move away.