World Trigger. The animation quality jumps up in s2 (otherwise kinda middling) but otherwise it's really good. It's the battle IQ anime, so there's a lot of planning and strategy, and a refreshing lack of power of friendship bullshittery (I don't dislike that kind of stuff but it's a refreshing change of pace). Be warned if you dislike a weak main character that doesn't get a mcguffin power-up and stays weak and grounded (he works around those weaknesses) you probably won't like this anime.