U are misinformed very badly. It was 666 satan that took inspiration from Naruto not other way around. It started in 2001 while Naruto had started way back in 1999. His brother even admitted this.
Also their art is similar since they are brothers and use the same techniques of cinematography to represent action scenes.
OT: Its better than average. But better than Naruto?? No. U_U
U should give it a try though. U will see its similarity to Naruto in art and story telling. Its a story about an orphan just like Naruto. U_U
From the wiki.....
Jio Freed has a few similarities to Naruto Uzumaki, the main character of a hit manga series created by Masashi Kishimoto, the older brother of the 666 Satan author Seishi Kishimoto. Such similarites are as followed:
Both were shunned by others around them, but soon made many friends throughout their life.
Both carried demons inside, which granted them tremendous power when injured or scared.
The two of them both dreamed of becoming a ruler; Naruto wanted the be the leader of his village, and Jio dreamed of conquering the world.