 If you liked
Basilisk: Kouga Ninpou Chou
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 ...then you might like
Samurai Deeper Kyou
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After watching both series, there's definitely some similarities between these series not just on historical terms but also the fact that both series contains
+the theme of clan rivalry
+a darker story as episodes progresses
+forbidden love
+betrayals
+supernatural elements
+an adventure like feeling as the main characters are in a form of journey
+in depth drama with emotions added in