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 drafted regulations for a "flower garden club", which was intended as an educational space for commoners. This marked the beginning of Japan's first school for ordinary people, which opened in 1670 after Banzan retired from his domain. In 1654, when the Bizen plains faced floods and severe famine, he focused all his energy on aiding Mitsumasa with relief efforts.