I don't really like this story. There are many reasons, but one of the more important ones is the lack of double-checking. The number of guilds in each continent was supposed to be 62, not 61.
More importantly, the characters feel kind of bland. Sure, they express emotions and fit the most basic architypes and personalities, but there isn't much after that.
Finally, this novel feels like a story that was thought of on the spot. The little details that allowed Zack to win the day felt less prominent when the author write something like this: 'Little did everyone know, there was a teeny-tiny itsy-bitsy little glitch that everyone overlooked and only Zack knew because he reincarnated, and that's (insert ex-machina).
