I mean, it does sound pretty plausible. You say you've never met anyone taller than you, and now you have a sword that's longer than any other one you've ever seen. It's fine if you want some time to think it over, though.

[ skepticism is probably the more common reaction, with people like kiyomitsu who denied it for a series of weeks and toshi who tossed his spear into the closet and never looked back... meanwhile, he thought the idea of being a sword person/spirit/thing was pretty rad, and jirou just flat out remembered it. ]

I'll look into the sheath later — knowing which centuries to start around is already a great help. What about yours, then? Does it have a name like mine, like 'tachi'?