A little bit of history to explain the Naginata;
The naginata is the iconic weapon of the onna-bu geisha, female warriors from the Japanese nobility.
Wives were expected to defend their castles while their samurai husbands were away at war.
The naginata enables her to keep opponents at a distance, making up for their lesser height, weight, and upper body strength.
Itagaki, famous for her naginata skills, led the garrison of 3,000 warriors out of Toeizakayama castle
against 10,000 Hōjō clan attackers before being overpowered.
When Cavalry battles become more important, the naginata proved excellent at dismounting and disabling riders.
The widespread adoption of the naginata forced the introduction of greaves as a part of the Samurai's armor.
However the introduction of western matchlocks reduced the use of the naginata and were replaced by the yari (spear).