Kamui Gaiden (2009)

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KAMUI is a Ninja on the run from the world of Ninja bound by rules in search of true freedom. However, he is burdened with the fate, where it is not allowed to take the secret of their powers outside of the tribe -- if you are born as Ninja, you must die as Ninja. This brings him to constantly fight for his life against other Ninjas who trie to kill him and hide the secrets within. He does not trust, and he does not love. Showing weakness leads to immediate death. An incident brings him to an old fisherman's village, where he finally starts to feel trust and affection towards other people. However, his pursuers where just minutes away from setting up a huge trap on Kamui...