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Japanese literature
In accordance with the rules of the Aizu Domain, her mother, Toshiyo, trained her son, Shun, to become a samurai in Aizu -- until she gave up her favorite mathematics. In the third year of Keio, the Emperor Komei died and it became difficult to unite the Imperial Court and the Military Government. Before long, the Satsuma and the Choshu clans advanced their troops to Aizu. Toshiyo suppressed her mother's kindness in her heart and sent Shun to the battlefield with pride in Aizu.