I had failed to notice the screw in the bottle.
I had to question Shizuko, was this little convenience even necessary the work?
Makes you wonder how the author will give relevance to this little piece of "technology".
When will Shizuko meet foreigners?
Japan my be very ignorant at this time, but the rest of the world also. Europe is still in the Renascence, I think, so Shizuko can also make an impact in the West if she ever meets and talks with foreigners.