In Meiji 15 (1882) the Metropolitan Police Department (Keishichō 警視廳) in Tōkyō, sent a letter to the famous Ryōi Shintō-ryū Jūjutsu teacher Shimosaka Saizō (下坂才蔵) in Kushihara, Kurume and as a result Shimosaka recommended the following teachers to form the Metropolitan Police Department Jūjutsu Shihan (teachers) group:

Hisatomi Tetsutarō (久富鉄太郎) of the Sekiguchi-ryū (関口流)

Naka Danzo (仲段蔵) of the Sekiguchi Shinshin-ryū（関口新々流）

Nakamura Hansuke (中村半助) of the Ryōi Shintō-ryū (良移心頭流) and his training partner

Uehara Shōgo (上原庄吾) of the Ryōi Shintō-ryū (良移心頭流）

Together these four had been known as the four Tenno Kings (四天王 - Shiten'nō) of the Kurume Jūjutsu world. Their fame reached throughout the entire nation

Once within the prestigious Tokyo Metropolitan Police Department, Nakamura together with Uehara, Hisatomi, Samura and Matsugoro Okuda (奥田松五郎), created the 'Metropolitan Police Department Jūjutsu Form', that consisted of the techniques necessary for police officers to perform their duties.

Nakamura came to be known as one of the toughest men in Japan, due to his strength and history of challenges.