Time to put you out of your misery!
What we have here is a Miso Muddler. You stick the business end into the miso paste and twist it. Extracting it carries out the correct quantity for a standard serving of miso soup. Put this into boiling water and stir, so that the paste dissolves.
Here is the packaging
And a close up of the thing in use.
Some alternative designs can be seen here.