After the release of Gohan's book, "Groundbreaking Science", which informed the general public of advanced martial arts, the people of Earth took great interest in fighting. Some specifically gained interest in the theory of channeling ki energy through swords to increase the speed and power of strikes because of the book's article "Katchin Can Be Cut!". This article reveals that the dense material Katchin can be cut, which greatly intrigue Trunks and Goten. "Swordsmanship is cool, isn't it. Let's set up an awesome school all by ourselves!", the two become enthralled by this motivation. Via intense training, the two are able to develop their natural potential and, as adults, found the Kikoukenjutsu Sword School to educate the planet's new generation of warriors.
In Age 820, remnants of the Frieza Force attack Earth and the Kikoukenjutsu Sword School is reported to play a major role in their defeat; being the only major fighting school established until a year later when Krillin and Tien's schools are founded. The Kikoukenjutsu Sword School still exists as of Age 1000 and is one of the most notable martial arts schools on the planet.
It should be noted that swordsmanship itself predates the foundation of the Kikoukenjutsu Sword School, as shown by various characters such as the Bear Thief, Yamcha, Chi-Chi, Ninja Murasaki, Pirate Robot, Mercenary Tao, Yajirobe, Gohan, Future Trunks, Kogu, Dabura, and Janemba. King Cold demonstrates being somewhat familiar with swords and briefly wields Future Trunks' sword before his death. In Supersonic Warriors 2, Future Trunks states he learned swordsmanship from Future Gohan who had learned to wield a sword during his training under Piccolo during Saiyan conflict.