Needs the 2nd season asap. I never like to spoil any part of anything, so I'll leave a review w/o discussing the storyline. The anime doesn't drag on showing useless emotions for a long time (as most animes do to fill up the time), but is very quick to the point. Yet, it doesn't feel forced and can be easily followed along. This shows the technique which the narrative is played out is on point.
The actions and the fight scenes are decent, (a few of them are jaw dropping). Most importantly, though, the anime isn't all about fighting using the given abilities. Rather, it involves such good tactical warfares using those abilities, so the fights NEVER get old. Every fight has a different setting and therefore a different strategy, and it's just a cherry on top that our hero gets stronger as he learns from each. It's def worth the time, so try it!