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You can stream Casshern Sins (2008) on Crunchyroll with a subscription.

After the murder of Luna, the robot society that rules the planet starts to rust and decay. Death and despair spread through the land like wildfire. The only one unaffected by the affliction that becomes known as "The Ruin" is Luna's assassin, Casshern. Unable to remember if he really triggered this capital sin against the entire mechanized civilization, Casshern embarks on a journey to unravel the mystery that connects him, Luna, and the plague.

A haunting, melodic vocal performance breathes life into a world dissolving into orange dust and scrap metal. This melancholic odyssey trades traditional action for a slow-burning meditation on immortality and the beauty found within decay.

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