Quote Originally Posted by The Unknown Guru View Post
Historical inaccuracies FTW! Guns were in Japan long before 1671, and the Emperor was completely irrelevant during the Edo period.
Also, when they read Hiro's notes in the present time, the historian should realize on the spot that something's wrong. The Japanese writing system has been truly fixed in the present form after World War II, and you can see clearly in the notes that Hiro uses modern ortography.