 If you liked
Phantom: Requiem for the Phantom
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 ...then you might like
Btooom!
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The story lines both start off with the protagonist waking up in an unfamiliar and isolated place alone, suffering from memory loss. Their closest partners are girls who help them come to terms with killing others. Both protagonists are troubled by the thought of becoming a murderer, but are forced to kill other people in order to survive. The animes both revolve around the theme of "Kill or be killed".