During this period, his sister Toyoko began studying Tendō-ryū naginata under a female instructor named Mitamura Chiyo (in Japan, arts focusing on the handling of naginata have been practiced almost exclusively by women since the Edo period), and she would continue practicing that art for the rest of her life.
Selama periode ini, adik perempuannya Toyoko mulai belajar Tendō-ryū naginata di bawah instruktur wanita bernama Mitamura Chiyo (Di Jepang, seni yang berfokus pada penanganan naginata telah dipraktekkan hampir secara eksklusif oleh wanita Jepang sejak masa Edo), dan Toyoko terus berlatih seni tersebut selama sisa hidupnya.