At some point I was thinking after sawing the movie Chanbara Beauty, that I would mix assamites, katanas and ninja-action together. But quess what, not everything is ment to be mixed with Vampire: the Masquerade. At first the idea sounded fun, but when playing it few times I suddenly realized that even if katana is cool, ninja is cool and vampire is cool, together they are ridiculous.
I don't say, that ninja katana game wouldn't be fun, but there is some limits for it. There is lots of games and systems you can play that type of action packed slicing and sneaking, but I think Vampire is for different kind of gaming after all.
Looking at my game shelf and thinking what games would have been better for that kind of action than choosing V:tM.
For Chanbara Beauty like zombie katana action, All Flesh Must Be Eaten would have done it well, I suppose. I only have read the Introductory pack but the rules are quite lite what means quick play. I am not sure what kind of martial arts or hand-to-hand manouvers basic rules have to offer.
Code/X could work, it is also simple system, but it is more like military operations spec ops game than ninja-action.
Cyberpunk v.3 not sure at all, it is too intimidating and damn ugly to even open anymore. I tried to read it but couldn't. Though if I had CP2020 I would check it out if it could handle the ninja stuff.
Kult has martial arts skills and manouvers, but for me the system is a bit too clumsy. Great setting, but rules could be better. And for that ninja stuff all supernatural and occult stuff presented in book are not necessary at all. So only rules would be used, and that would be failure for me.
New World of Darkness core rules. They are simple and easy to apply, but somehow too simple for me. Or I don't just get them right. There is Armory Reloaded what introduces more combat rules, but I don't own it. As how nWoD rules are presented in core book, they are easy and fast, but a bit too simple for my purpose.
Old World of Darkness/Vampire: the Masquerade rules are great, and work in the purpose, but as I said in the beginning, mixing vampires into ninjas and katanas is a bit too much for me.
Unknown Armies could work, what I have read it I like the rules. They are also quite simple. Not sure though, how does it handle the martial arts and melee fighting and acrobatics and other special and neat manouvers. And there is also that supernatural background what would not be useful in my action game.
Problem is, there is some setting I own could handle the ninja-stuff, but any of them doesn't sound cool or useful, let's say "agile" enough to handle it properly. And many of those games are horror, what is not needed for that scene. I am not sure what game would do it for me, maybe Feng Shui? Haven't actually played nor read it ever, but it might be that hong kong action game what could handle it well what I tried and failed with V:tM.
If I find a cheap copy of Feng Shui somewhere, I might try it out.
Oh, and I have downloaded pdf of Violence roleplaying game. Not sure though, is it for more brutal action. Like not sneaking behind your enemy and slitting his throat open, but hitting your opponent with a log and spitting on him. Could check that out soon enough though.