The latter request was refused, but the couple defied him, and married on 16 March 1892 in Tokyo with the consent of the Austrian and Japanese foreign ministries.

The couple then returned to Europe, where Mitsuko and their two sons, Johannes and Richard, took over management of the family estates in Bohemian Ronsperg.

Once established, Mitsuko learned French, German, mathematics, geography and history in an attempt to counter the hostility to Heinrich concerning his return with a foreign wife.

Heinrich died in 1906 and Mitsuko took over the estates and the children's upbringing and education, while studying law and economics herself.

When her second son Richard proposed to marry an actress, Ida Roland, Mitsuko became intensely angry and forbade their marriage.