I'd use it to cook hotdogs and smores over a campfire.
Just wanted to point out that a real life Sephiroth's Masamune would be unwieldable. The reason for the unique curviture of katanas is so that it can be drawn and sheathed quickly and efficiently. A katana of such length is impossible to draw or sheath and it's movement in battle is also hindered by it's restricted movement. No one wants a sword they can't kick ass with. Hi!