The closest I could find does seem to amount to kage tora gatana. Or in other words, shadow tiger sword, as Frezzato already mentioned.
I don't speak japanese properly though. I study it, but I have a long way to go yet, and most of that came from google translate.
Besides, even if I might've understood kage-gatana (yeah, has a g in translation, not a k. Don't ask me why either), as 'shadow sword' if someone said it out loud, I didn't recognise the kanji regardless.
Although, I was fairly confident the last kanji is...
Well, it means 'cut', 'knife','sword' and so on.
No real challenge figuring out why it'd be on a katana. XD
(trouble with kanji is the pronounciation can vary with context. To understand kanji you need to understand the meaning to get the pronounciation. With most text westerners understand, you need the pronounciation to understand the meaning, so it's backwards. Ironically, this has resulted in me knowing the meaning of several kanji, but not the japanese words that go with that meaning.
Like the kanji for sun, moon, fire, water, mountain, rice field, wagon, person, big, tall, above, below... I recognise the meaning easily enough, but not the japanese word that goes with it. XD)