 If you liked
Kizumonogatari I: Tekketsu-hen
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 ...then you might like
Devilman: Crybaby
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In both, the protagonist is changed into a half human-half monster (vampire/demon) against his will forced by the circumstances and because they wanted to help someone. Both are adaptations that remake some aspects of the source material while still staying faithful to the spirit of the original. They also have highly stylized animation, one with animation style typical for director Yuasa and one with animation style typical for studio Shaft. Both stories employ plot twists.