Episodes 1-6 made sense, after that its all just battle battle battle, reckon, strategy and then some more battle until the very end of last 6 minutes in episode 13 when its finally over.
This is one of those bait anime's where you start watching with a promising story and end up watching repetitive 2D animation (at times) for last 6 episodes.
Strategy plot is very vague in this anime, as its mostly commentary and observation apart form a few unorthodox methods of battle.
It still good watch but I just wasn't prepared for that though, that's my opinion on the anime. If they had made 24 episodes with more expansion on the outcomes of the battle and circumstances, it may have been a more entertaining show.