It's bad.
That was my TL;DR, but I will explain why I think so.
As with most Video game adaptations, the story falls flat. Main Character's village is wiped out, he gets super fighting magic power in accordance with the in universe magic system and gets OP. So far so very uninspired.
Since that is needed for a game, not problem here, but the way this is written it feels not like a plot, but some keywords of an idea of a plot. Like someone described to someone else what they might like in a generic story, without going into detail and the other person produced this without adidng anything.
The MC gives another dude the talk no jutsu about friendship and shit before the other dude was even an established character. The emotional moment fell flat on it's face because the viewers were never informed that they had to care about that guy (except maybe the fact that he was one of the seven guys with the special powers mentioned in the title). There was no bonding before, he was just shown to the viewer brooding about some stuff - but how are we supposed to care for a dude who was on screen for less than 2 minutes before falling to darkness?
And this is not a "so bad that it's good" show. It's not a parody. It's not intentionally bad. It is just bad.
Anyway, the show also has good points:
- The art is quite decent
- the setting is nice, I enjoy some industrial era elements like trains with magic
- The fighting is okay.
But you stil have to suffer through this atrocity of a plot, so I rate this 4/10, get better.
Don't watch this if you have better stuff aviable.