The plot is so messy and the mc doesn't develop his own character. Weak and clueless. Another characters got more page time than mc's 2 close friends. Wasted. The action is so well drawn and good though. It's Magi all over again (i hate Sinbad arc). I'm getting boring reading this actually. They doesn't add much anticipated factors that most shounen manga use. It took 100++ chapter to know tiny new info about their father.
This started out good but it kept downhill after that. The mc after the fisrt he became so useless that he just becam an annoyance to the hole story. It would have been goof if the mc just disappeared because the sides characters are better. And when he finally gets a little useful it doesn't mean anything as you are already disappointed