Just fyi, ninja-to, aka a straight one-sided blade with a square tsuba, never existed. It's a product of the whore-mother of all myths - Hollywood. This weapon is pointless, it doesn't make sense, if a ninja or whoever the fuck else wanted to kill somebody with a sword, he'd use a katana or a similar existing sword, not invent a backwards ass design for no purpose other than to show off.
A katana, a real sword that was used on the battlefield, is a heavy two-handed sabre in essense. It's not magical. Fuck weaboos. I win. The end.