Sauron studied fencing at the Dojo opened by Kenjiro in Frost Moon Village in the East China Sea since childhood. His double fencing has developed rapidly. At the age of nine, he was able to defeat the adults in the Dojo, but he was defeated by Guina, the daughter of Kenshiro, a Dojo teacher two years older than him. Sauron has fought her 200 times/kloc-0 times, and still has not won. After the last game on the moonlit night, Guina revealed to Sauron that she didn't want to be a girl and was not as good as a boy when she grew up, so she couldn't become the world's first swordsman, and Sauron didn't want to beat Guina because of physical differences rather than relying on technology, so she made an agreement with Guina to become the world's first swordsman. But the next day, guina died unexpectedly because she fell down the stairs. Sauron asked the Dojo teacher, Guina's father, to get Guina's big sharp knife and sword as a memorial to Guina, and vowed to be even better and become the first swordsman in the world to hear his name even in heaven. After getting the word "harmony", even Guina worked hard together and began to exercise the three swords method of becoming famous in the future.