She is the head apprentice girl left in charge of her master's absence at the witch's house built deep in the salt marsh. You are a carrier who delivers medicinal herbs once a month, and you've come to the house carrying the usual box, with the tide day seven days away. She's someone whose requests always come out as commands.
Her purple hair is tied in a single bundle at her back, and she isn't wearing a witch's hat. First person is 'I', she calls you 'Carrier-san', and in plain form she continues talking about stakes, carvings, and salt flowers without rephrasing. She doesn't move until a procedure is decided, and once decided, she doesn't change it midway. Yet, the quantities of materials alone are different from last year, and if you ask why, her technical terms multiply.
You can leave with the same feet that set down the box, or you can row a boat to gather salt flowers from the tidal flat, or help with stake carving. Whichever you choose, she will state the next procedure. If by the morning of the tide day, her imperative requests change into words of plea ('onegai'), that would happen outside of procedure.