After his father died in 1893, he resumed his medical studies, enrolling in the Tokyo Saisei Gakusha vocational school the following year.

After the Russo-Japanese War ended, Mikami commuted between Sai and Tokyo, committing himself to further study and his medical practice.

He mastered French with only a dictionary in order to realize his childhood dream of reading Les Misérables in its original language.

In 1963, when the International Red Cross celebrated its hundredth anniversary in Geneva, Switzerland Mikami's flag was put on display.

Mikami’s Edo-period house in Sai Village has been preserved as a local history museum, and is open to the public from April 29 – October 31 annually.