Using a Japanese sword in each hand is hard because a Japanese sword is basically designed to be used by grasping with both hands and the fencer has to use both hands separately, and consequently just a small number of schools focus on two-sword fencing.
基本的に両手で把持して使用する目的で作られている日本刀を片手で使用する事、両手を別々に使用すること等、日本刀での二刀は難しく、二刀を中心とする流派は少ない。