I once saw a video talking about how the katana isn’t the right sword to compare with a longsword. Longsword was a battlefield weapon; katana was more of a decorative sidearm. Kind of like an officer’s sabre. Another weapon, called a “tachi” if I recall correctly, was more common in an earlier era when Samurai spent far more time on actual battlefields. It was a longer and heavier blade.

Yes. That said, can Kaiki also be regarded as “best boy”? Given the way he is depicted in Hitagi End, Senjougahara is able to see him that way.

As a heterosexual male, “best boy” is a topic I am unlikely to bring up of my own accord, but I would have no difficulty or discomfort engaging on the topic with ladies and/or gaybros.

That said, sometimes a male character is so compelling he gets ironically assigned the title “best girl”.

Sometimes search is just buggy. I had the same problem when I first started: couldn’t access certain communities from my instance until one day, I just could, for no particular reason I could see.