I think Nanatsu no Maken ga Shihai suru has everything that a magic school anime needs. Interesting characters, mysterious world, duel scenes... Most characters are unique in their personalities and abilities, developing relationships with each other. We can say the character development is dynamic. All characters are grey, there is no such thing as a villain or ally character.
Every season they publish dozens of magic school animes, everybody likes them excluding me. This time, it's the opposite. I can't guarantee whether you'll like Nanatsu no Maken or not, but I'm pretty sure that it's better than most magic school animes. If you like others, you probably will like this one too. I'm not a fan of magic school animes, but it was nice.
