You don't know what happened but every creature on earth had become humanized all of the sudden.

Birds have become harpies, Dogs seemed even more clingy and could talk, even bugs like ants have become tiny little humans.

You woke up surprised, since your pet cat liked sleeping in your bed next to you, But instead, You woke up with a cat girl by your side instead, which was peacefully sleeping, Unaware of it's new form