Are there no left-handed swordsmen?

Most samurai considered the sword sacred. Being rude to a sword was considered extremely disrespectful. It was strictly forbidden to step over another person's sword, and there was no choice but to be cut to death. There were also cases where sword scabbards collided with each other as they passed by, leading to a sword fight.

As such situations occurred frequently, as a countermeasure, it was decided to put it on the left hip and pull it out with the right hand. If you were born left-handed, you were forced to become right-handed. In conjunction with this, required to walk on the left.

Samurai are also professional soldiers, so if there is something emergency at his lord, they will go to the battlefield. If you move around in a chaotic battlefield without order, your swords will inevitably touch each other and a swordfight will occur between your allies. This isn't going to be a battle. However, if you walk on the left side with the sword attached to your left hip, the scabbards will not collide. In other words, driving on the left was strictly adhered to in order to maintain military control. Another advantage of driving on the left was that they could quickly counterattack in case of unexpected enemy attacks. Left-handed people are still more likely to be viewed as heretics, although not as much as in the past. This may have something to do with the fact that samurai always drew their swords with their right hand.

The Mibu Gishiden is a movie about the Shinsengumi. The person on the right, Kamo Serizawa, has a sword on his right hip, which means he is left-handed. Although the historical facts are unknown, it suits Kamo Serizawa's character as a scoundrel.