 If you liked
Phantom: Requiem for the Phantom
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 ...then you might like
Akame ga Kill!
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The stories of these series are about assassins life. Both contains violence, blood, a lot of action, fighting, deaths. Also art is really great. So if you like this kind of stuff I really recommend it.
However for me Phantom: Requiem for the Phantom is darker and much deeper. In Akame ga Kill! you can find comedy elements. And unlike the Akame ga Kill! assassins which kills on their free will Phantom: Requiem for the Phantom assassins are forced to kill to live.