In 1651, he drafted the regulations for a , literally "flower garden club", a place for the education of common people. This was the initial incarnation of the first school in Japan for educating commoners,  which opened in 1670, after Banzan had left the service of his domain. In 1654, when the Bizen plains were assailed by floods and large-scale famine, he put all his energies into assisting Mitsumasa with relief efforts.
In 1651, he created rules for a "flower garden club", which aimed to educate commoners. This was the initial stage of Japan's first school for ordinary people, which opened in 1670 after Banzan left his domain. In 1654, when the Bizen plains were hit by floods and famine, he concentrated on assisting Mitsumasa with relief work.