Its a good popcorn anime. You've probably seen most of whats in here before, Shonen protagonist, and I almost stopped half way through as it felt generic. It picked up pretty entertaining. I was wary to start this for a while, the smiling protagonist turned me off for some reason, but I like the backstory for why he smiles. I do enjoy the theme of fire, and in my head canon it felt like a successor to Last Airbender, if the fire benders were the only ones left.
The art and sakuga excellent. The knight character is funny. The Lucky Lecher gets old pretty quickly though, and when it starts to get old, it slows down which is good. Go enjoy