Phantom: Requiem for Phantom

If your looking for a complicated love story in the midst of murder, conspiracy, deceit and countless assassination plots then this is the series for you... ;}

Found here..

Its centers around a male Japanese tourist who witnessed an assassination taking place. The assassin turned out to be a Japanese girl who looked no older than himself. In his shock he was captured and brainwashed. In his state of amnesia he was forced into becoming an assassin himself. From then on the story progresses through his training all the way to him going on actual missions. I have yet to continue watching because of time constraints but its definitely worth seeing till the end...

:}