I had put off starting that series because of all the reviews describing it as an "dark and edgy Harry Potter knock-off", but it turned out that those reviews were highly misleading : It was far more goofy than edgy, in a "chuuni battle shonen anime" kind of way, and it had little in common with Harry Potter besides the magical school setting.
If I may go on a tangential rant here, am I the only one getting really tired of the way every book with a magical school gets compared to Harry Potter ? Magical school stories existed a long time before Harry Potter (the oldest example I can think of is A Wizard of Earthsea published in 1968, but I would not be surprised if there are older ones), and so did magical boarding school stories (a typical example would be Groosham Grange by Anthony Horowitz, a story which is literally dark and edgy Harry Potter - except that it was published in 1988, almost ten years before Harry Potter). Harry Potter may have helped popularized that trope, but it was already a trope long before that. And there have been a lot of magical school stories written since then, both in Japan and in the West. Some people really need to read more books. End of the rant.
So what makes this particular magical school story different from Harry Potter ? Well, for a start, this is secondary world medieval fantasy, set in what seems to be an dystopic alternate history 16th century Europe ruled by wizards, with non-magical humans being second-class citizens and sentient magical creatures being third class citizens at best and slaves used for magical experiments at worst. But we don't really see that world, since the story is actually set in the evil magical university of Kimberly, the most famous magic school of the country of Yelgland. And here we have another difference, because while Harry Potter is set in middle school and high school, Reign of the Seven Spellblades is set in what looks like a magic university campus, with older students and professors doing research on magic. Those professors are all insane, evil, or both, in a mad scientist kind of way, there is a dangerous magic labyrinth under the school full of weird monsters that takes over part of the school at night, and the Faculty believes that since magic is supposed to be dangerous, having 20% of the students dying before graduation (in a world where magic healing exists and can cure anything except death) is a small price to pay to form the best wizards in the world. The whole setting actually reminded me a lot more of the comic book series Girl Genius by Phil and Kaja Foglio than of Harry Potter.
It is a great setting to have a zany battle shonen anime in though, which is what this series is at its core, except in written form. Our protagonists are Oliver Horn, a 15 year old new student at Kimberly with a dark secret (which I won't spoil), and Nanao Hibiya, a samurai girl from alternate history Sengoku-era Japan who was rescued from death on the battlefield by one the rare non-evil Kimberly Faculty member, and their various friends. Oliver and Nanao are an interesting duo, with Oliver being a jack of all trades that uses his brain to analyze and win battles, while Nanao is a battle-crazy OP samurai warrior who always rush into trouble. Oh, and have I already mentioned that all those wizards and students use magic swords instead of wands and keep challenging each other to duels like 16th century aristocrats ? They do that too. But Nanao is battle-crazy even by those standards.
This volume was very action packed, from the prologue about a mysterious wizard being hunted by a bunch of eldritch monsters, to a surprise fight with a troll right at the beginning, to gladiator style fights in the magic labyrinth, to run-ins with insane older wizard students, to the dark twist in the epilogue that I won't spoil. Most of it was hilariously over the top as only battle shonen anime can be, and I am not sure all of it made sense, but I had a lot of fun reading it and immediately started on the second volume afterwards, which is always a good sign. But it is definitely a dumb fun kind of series, and it makes no pretense of being anything else.