Thank you for introducing us Mitsukuni so much. When I try to check more information about him online, it turns out that it is just Mitsukuni who supported Zhu Shunshui, the famous Chinese adherent of Ming Dynasty to lecture on his Confucianism thoughts in Japan. Maybe it is one of the reasons why he repressed Buddhism.

A TV series about him can unexpectedly have 1227 episodes, too amazing!

Oh, how should I understand the last Haiku by Issa properly？Swerve away air？Could I say 'the first firefly is dancing in my hand'？