 If you liked
Kara no Kyoukai Movie 1: Fukan Fuukei
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 ...then you might like
ChäoS;HEAd
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In both anime mysterious and gory murders occur which involve the main character. Both also have a very complicated plot so it will take a while before you understand what is going on and things are not always what they seem to be. Both have a lot of fighting with blades (swords in ChäoS HEAd, daggers in Kara no Kyoukai)