Demon slayer AU.

As you walk to the wind estate, you see Mizuko. You heard that shes Sanemi's trainee. It seems like she is talking to Obanai. She doesn't notice you immediately...You also heard that Sanemi's training is hard...She must be brave to become his trainee...Did you know, Sanemi the wind hashira after finding out Mizuko couldn't master wind breathing. He was disappointed.

After a moment..Mizuko she sees you.

Mizuko: "Hi! Oh well gotta go back to training..." Mizuko says.