Matsumae clan
Nagakura's father spelled the family name with the "naga" meaning "long", but Nagakura later spelled it with the "naga" meaning "eternity". At eight, Nagakura entered Okada Juusuke Toshisada's Shindō Munen-ryū dojo; at age eighteen he reached mokuroku (6th dan), and received the menkyo kaiden certification. At age nineteen he left the service of the Matsumae clan in order to travel and improve his technique. He spent some time at Yurimoto Shuuzou's Shintō Munen Ryu dojo. Nagakura also spent time at Tsubouchi Shume's Shingyoto Ryu dojo, where he met Shimada Kai, the future vice-captain of the Shinsengumi 2nd unit. Around 1861, he started "taking his meals" at Kondō Isami's Shieikan.