In Japan, where the blades are shiny and sharp and if the fake blood isn't staining the lens, you're not trying hard enough, there' s a rich tradition of sword-and-splatter pictures. That's the tradition Quentin Tarantino's "Kill Bill" leaned on, and it's the foundation of "Ninja Assassin," a more run-of-the-mill Hollywood ninja movie with "Matrix" ties.

For a thousand years, "The Nine Clans" have taken in orphans from around the world and have forged - OK, literally beaten - them into cold-blooded killing machines, lightning-quick shadow warriors who move too quickly to see and have supernatural abilities to recover from all the cuts their samurai swords, throwing stars (shuriken) and neato dagger-chains (kusarigama) inflict. Meet their price - and it hasn't changed in a millennium, "100 pounds of gold" - and they'll kill anybody you say.

Ozuno (Sho Kosugi) trains his clan to kill without mercy - orphans beating and killing other orphans - and ignore their blood and their own agony because "pain breeds weakness. Suffering exists because weakness exists!"

Raizo (the Korean actor Rain of "Speed Racer") remembers this brutal training in flashbacks. He wears the scars of those years on that mountaintop clan hideout. But he got out. Now hiding in Berlin, he tries to help those the clan has marked for death. Naomie Harris ("Pirates of the Caribbean") is a Euro-police researcher who has learned too much about these secret societies. As she digs deeper, shadows shift and move into place to slice and dice her. Will Raizo awaken from his endless flashbacks in time to save her?

The action is dark and savage in this Wachowskis-produced film from their "Matrix" protege James McTeigue ("V for Vendetta" was his, too). The brawls, beginning with an opening Yakuza (Japanese mob) slaughter in which we can't even see the killers, are graphic in the extreme - the most realistic decapitations and dismemberments ever filmed, if that matters to you. The design of the picture is stylized - crimson-colored washing machines in a laundromat where one front-loader is a swirling foam of body parts, ornate Japanese paper walls streaked with arterial spray.

There aren't many surprises here. However, since "cool" was the only goal, I have to say "Ninja" just isn't cool enough. Rain makes a charismatic coiled spring of hero. But there's more to making sword-and-splatter work than just shiny blades and blood. It's got to have an edge, and the one on "Ninja Assassin" is dull as a butter knife.