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Aoki Koemon was the apprentice of Sano's father at the Sano Material Arts Academy and its heir.

Koemon was an old friend of Sano Ichirō. They’d grown up together, but as adults Koemon always addressed Sano with the respect due him as the master’s son.

When Sano's father became to ill to teach himself at the Academy, Koemon introduce new weapons into the curriculum in order to be able to attract more pupils.

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