 If you liked
Haibane Renmei
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 ...then you might like
Yojouhan Shinwa Taikei
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Both are psychological and philosophical slice of life anime which heavily focus on characters and the motivation of their protagonists. In both you will find lots of questions left to your interpretation, an amazing unique animation and a beautiful orchestrated soundtrack. In order to enjoy any of both it is required to feel some sort of empathy towards the protagonist.