I read all this that Naruto and this are simillar not really, I can name like so many mangas that are simillar to 66, and Naruto. In most manga the guy like wants to be the strongest in the world or something like that and then has to travel or fight guys all around the world and gain power when he isn't strong enough, blah, blah. The Ruby, Sakura thing is simillar but again that same scene is so normal. In Ranma akane did something like that, ran in the middle of a Ranma Ryuoga final attack. I mean I could go on. The whole combo thing, Well I can name some other sources where guys do combos and they start calling it as they do it, just like Naruto Rendan and that 6, 6, 6 rendan. Then the fact that they are kids. okay Goku and a slew of other characters where kids. make Goku from Dragon Ball(not Z for people that don't truely know and apperciate Dragon Ball) and give him the dream of world domination and their you go. ITs simillar. its not hard if you mix and match. The manga's are different but like all and most manga's they are the same. I find 6,6,6 closer to a one piece meets Bleach.