When will Japanese author stop masturbating about their katana? It's not even good, god damn. At least be a bit creative and give him a Naginata or something, or fk, give him a fking matchlock, have some creativity for god sake.
...Awesome! Some mythical (for this world) steel! Let's use it as summoning fodder. It's not like I want to be on the front lines using it all the time.
As much as I loved how he played the two sides against each other (and felt kinda guilty at being called a cute little brother), I feel like some of these strategies...wouldn't hold. I'm not sure if it's too obvious or playing out too conveniently or something, but the way his moves develop feel "off" for me.
Just once I'd like to see an otherworldly item be truly alien and not the well beaten dead horse of glorious Japanese steel. That said I'll continue reading this because I'm such a sucker for isekai.