 If you liked
Phantom: Requiem for the Phantom
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 ...then you might like
Grisaia no Rakuen
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Main character is kidnapped by evil organization and trained as assassin. He is forced to kill against his will. Finally he rebel and fight against organization which destroyed his life. Main character is controlled by darkness, grief, lost meaning in life. He meets something special which helps change, find light in the dark. Both are great action, philological anime. Main difference is that Phantom is darker and sadder, and in Grisaia you can find harem.