The story is bit cliche if I say. A boy striving for power to avenge the death of his family by a certain someone. The story started by getting in a whole new school which is unbound by logic, yes, it was emphasized a few times. I also don't really like the unclear background. It wasn't really explained how it ended up to that situation. Why the hell in a normal world there's a a battle school which has the technology to use someone's soul as a weapon, it's a school, not some kinda secret organization.
But don't get me wrong, I like this LN. What make sit interesting is the character inside. How they make this absurd plot with least background into something exciting. I like how the MC is not just some generic super-blushing harem style type. And the exciting part is, the girl he ended up with is not the super tsundere style (which I got bored with), who at first glance seems to be emotionless but doesn't seem to be the case. Their relationship got even more interesting throughout the story.
In the end I really enjoyed this read more