Naruto: King of Hell

A boy from Earth was transmigrated into the Naruto world as Hatake Santoryu, a member of the Hatake Clan. After absorbing the memories of his new body, he was shocked to discover that it was riddled with defects from a ninja’s perspective. The most glaring flaw was his complete lack of talent for even basic ninjutsu, much like Rock Lee. Fortunately, he gained a system that enabled him to master the three-sword style, similar to Zoro. Through this power, he eventually rose to become known as the 'king of hell' in the Naruto world.