The lady is engaging in a familiar wordplay here as the place name Nakoso 勿來, the location of one of the barriers between Michinoku and the capital, was homophonous with na ko so な來そ, meaning ‘Come not!’
The lady is engaging in a familiar wordplay here as the place name Nakoso 勿來, the location of one of the barriers between Michinoku and the capital, was homophonous with na ko so な來そ, meaning ‘Come not!’