According to Zoel Giradel, who wrote an excellent Persona 4 FAQ hosted on GameFAQs, “Fuuma Bundou” roughly translates to “Wind Demon’s Claw.” This weapon has an attack rating of 190 and an accuracy rating of 94. It does not have any special features (e.g. Chance to Confuse, Chance to Enrage, etc.).
Now when September 11 rolls around, you can make an informed decision.
Again, if you have no idea what I’m talking about, please disregard.