 If you liked
Kyougoku Natsuhiko: Kousetsu Hyaku Monogatari
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 ...then you might like
Kurozuka
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As far as plot is concerned these animes are not particularly similar. Both feature supernatural themes, however this is not much of a connection either. The two features that makes these two anime similar are the general vibe, and the constant questioning throughout the series of whether it is uniquely brilliant or simply bizarre and annoying. In my opinion these animes have an element of both, however if you removed the bizarre and annoying elements you would be left with something that is purely average. If you like one you will probably like the other, however Kurozuka is the superior of the two.