Phantom: Requiem for the Phantom

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You can stream Phantom: Requiem for the Phantom (2009) on Crunchyroll with a subscription.

Mafia is rife in America where assassinations are a regular occurrence on the streets. Inferno, a mysterious company, is behind most of these dealings through the use of their near-invincible human weapon, "Phantom." One day, a Japanese tourist accidentally witnesses Phantom's latest murder. Desperate to escape, the tourist hides in a secluded building. However, Phantom, revealed to be a young woman named Ein, and the leader of Inferno "Scythe Master" captures the tourist and brainwashes him. Given the name "Zwei," this once peaceful tourist is now a puppet of Inferno with no memories. Drawn into a world of lies, deceit, and violence, Zwei must fight to survive, hopefully to one day regain his memories and escape from this world where he is constantly on the brink of death.

An accidental witness to a cold-blooded assassination finds themselves trapped in the crosshairs of a shadow organization. This lethal game of cat and mouse pits a human weapon against a world where life is cheap and every street corner hides a killer.