I've read only the first volume and I don't intend to read any past that. From start to finish, this story made me aggravated and extremely bored.This made utter the deadiest words for a story: "I don't care about these characters". And I said that more than once for just the first volume.
I was drawn to the initial premise: our protagonist is reincarnated as a sword, whom I will refer to as just "the sword". However, it has amnesia, so the reader is left just as in the dark as the sword about its past life. It quickly adapts to this new word and does what a sword does best: kills things, particularly the local monsters. How can it do this when it's just a sword? Why, because it's a psychic sword, that's how! He uses telekinesis to fly around like a thrown dagger in perpetual motion, killing any monster that it finds with either its blade or the environs. It quickly kills just about everything in its vicinity, thereby devastating the local ecosystem, until it gets trapped in an anti-magic field. Its is saved by a young catgirl named Fran, and they go a quest to be the very best like no one ever was.
It sounds interesting, right? My interest quickly dwindled with each monster the sword effortlessly slew. It's one thing to see a character grind and have them struggle through it, but it's something else when they have no trouble whatsoever. That makes a character incredibly boring, since there's no inherent danger or risk towards them, therefore every outcome is the same: they win with no effort on their part. Who would want to read a story like that?
The characters themselves aren't that interesting either. Sure, the sword has amnesia, but it has no bearing on its character, aside from its willingness to kill with reckless abandon. There's no point to the sword being a reincarnated person, since it doesn't lead to any meaningful character development. If that's the case, why not just make the sword a regular sword from that world to begin with?
Fran isn't any better. She's basically Raphtalia from Rising of the Shield Hero if she had all the personality sucked out of her. I get that she's supposed to be this stoic, soft-spoken little girl who's been traumatized, but again, this has no bearing on her character as far as I could see. Well, aside from maybe some hints that's she's a little psycho who's too willing to kill whoever makes her angry, no matter how petty the reason. Part of her character is going from a complete nobody to perhaps the strongest member in her guild. The problem is that it's all because she relies on the sword's incredibly high stats; without it, she can't do anything. Okay, so just disarm her and everything's fine, right? No, because the sword can just fight by itself if need be and aid Fran from afar. In the final fight of the book, something happens in regards to this that's so stupid I was left speechless. It was at that point that I realized every fight with these two was going to end the same way, high reward with no risk, and I gave up hope of ever caring what happens to these characters.
Personally, I think this story is testament to how an overpowered protagonist, when played completely straight and not balanced out by anything else, can ruin a story. When every fight ends the same, when the characters are just so uninteresting, when you have to force yourself to read on in the vain hope that it will get better, that's the mark of a story not worth reading. I won't stop you if you decide to read it, for whatever reason that may be, but you'll only have yourself to blame if you do. As for me, I just want my money back.